15 Secrets of Commercial Divers

Boris Horvat, AFP/Getty Images
Boris Horvat, AFP/Getty Images

Imagine some of the most physically demanding jobs available—supply line installation, construction, welding—and then imagine doing them underwater. That’s the life of a commercial diver, a rigorously trained professional who undertakes everything from bridge repairs to oil line maintenance. To get a better sense of this often difficult and dangerous work, Mental Floss spoke to several commercial divers for their thoughts on everything from the perils of decompression to swimming in sewage. Here’s what they had to say about a life in flippers.

1. DIVING DEEP CAN PRODUCE EUPHORIA (AND A WEIRD VOICE).

Commercial divers receive specialized training—either in the military or at diving instructional schools—to learn how to function hundreds of feet below the surface. The lower a diver goes, the more water pressure increases, and the greater the challenges. Jeremy, a commercial diver out of Louisiana who repairs and installs equipment for oil companies, says that working in such conditions can lead to physical exhaustion, pulled muscles, and a feeling of pressure on the lungs.

Plunging to a depth in excess of 100 feet can also result in nitrogen narcosis, which some refer to as "raptures of the deep" or the "Martini effect." It's caused when divers receive a higher concentration of nitrogen from their air supply due to the effects of the water pressure on the gas. (The air systems that commercial divers use allow them to breathe normally by providing air at a pressure equal to that of the water, but the lower they go, the denser the gas gets, and thus the higher the concentration.)

“It makes you feel drunk or euphoric,” Jeremy says of the narcosis. “The solution is to switch from a nitrogen-oxygen supply to helium and oxygen.” That cures the over-inhalation of nitrogen, but when a diver comes back to the surface or to a decompression chamber, their voice will be altered. “It’s an Alvin and the Chipmunks thing,” Jeremy explains. Some diving teams will use voice augmentation to de-scramble the high-pitched squeals when divers are communicating with the surface.

2. ABOUT HALF A DOZEN OF THEM DIE EACH YEAR.

A diver works with a cable on an underwater construction job
Boris Horvat, AFP/Getty Images

Most commercial diving is centered around underwater construction—often repairing or replacing infrastructure that facilitates water, oil, or electrical supplies. Divers are frequently charged with digging trenches to bury electrical lines using high-pressure water blasts to excavate the ocean floor. If these trenches collapse, it can result in a catastrophic situation; the cave-in can trap and bury a diver, clogging their regulator or causing them to take off their helmet in a panic, which eliminates their air supply. Jeremy says a number of divers die every year in such cave-ins.

If divers can avoid that fate, they still have to worry about a number of other ways they can meet an untimely end. “We use cranes and those can fall or drop their load on you,” Jeremy says. Cutting into “live” pipelines can also cause explosions, as can using tools that displace hydrogen from the water. In an enclosed space like a ship or supply pipe, that collected hydrogen could catch a spark and explode. “That could blow your helmet off or into pieces,” he says. All in all, 25 commercial divers died on the job between 2011 and 2014, according to the Bureau of Labor Statistics; another 310 suffered nonfatal injuries or illnesses.

3. THE DEEPER THEY GO, THE MORE THEY EARN.

Diving jobs vary in pay according to risk, duration, and other variables, but generally, a diver’s base pay is usually supplemented with “depth pay.” The further down they go, the more they can make.

“It’s basically about a dollar a foot,” Jeremy says. “After 150 feet, the price can double to $2 a foot. Added on to regular pay, a 12-hour day can add up.” A diver working at 300 feet might net $1000 in a shift. Saturation divers, who can go 1000 feet down and are required to live off-shift in a chamber pressurized to the surrounding water in order to avoid decompression sickness, or the “bends,” can make even more.

4. SOMETIMES THEIR SUITS ARE HEATED.

Going deeper into the water means enduring more frigid conditions. To offset plummeting temperatures, divers need a way to keep their suits warm. “Below 80 feet, it gets cold,” Jeremy says. “We either pump water into a wet suit or wear a hot-water suit.” The former allows water to come in and make contact with the diver's body, typically from a heated source at the surface; the latter has water channels throughout the suit that branch out and keep divers from getting too cold. Because hot water suits can maintain a more consistent temperature than delivering warm water from above, they are most often used at 200 feet and lower depths.

5. THEY CAN WIELD FIRE UNDERWATER.

Most tools meant for underwater use are hydraulic (involving the use of water or other liquids), since they’re largely unaffected by water pressure. Fuel-powered or pneumatic tools (those that involve the use of gas) don’t really work, but divers can still make use of jackhammers, chainsaws, and other devices you’d find in an above-ground construction job. Others, however, need to be adapted.

“In my opinion, the most interesting adaptation is the BROCO torch,” says Brian, a diver based in New England. The BROCO torch uses direct current to ignite a magnesium rod and oxygen mixture that burns at approximately 10,000 degrees and can cut through metal like butter, even underwater. (A/C, or alternating current, is what we use in our homes—but because the direction of the current reverses many times a second, Brian explains, it can freeze the diver in place while electrocuting them, making it too dangerous for underwater use.)

6. THEY MIGHT FIND DEAD BODIES.

A human skull sits half-buried in sand
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According to Jeremy, many recovery dives for people suspected of drowning fall under the purview of local law enforcement. Still, commercial divers can encounter someone who’s wound up in a watery grave. “I’ve done helicopter recovery jobs,” he says, referring to crashed aircraft that can harbor passengers. Once, while working on an oil rig, he stumbled upon a dead scuba diver. “It was more of a skeleton in a scuba suit,” he says. If a diver does find a corpse, they're unlikely to ever know the history of how the body got there; such discoveries are required to be passed on to the Coast Guard for investigation.

7. THEY CAN WIND UP FEEDING FISH.

A school of fish swim in the ocean
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“We encounter marine life all the time,” says Mike, a commercial diver who now works primarily in and around the Great Lakes. “When working the ocean, if we are cleaning off marine growth, sometimes you will get some fish that come up and eat what you are cleaning off.” Mike says that commercial divers frequently spot sharks, barracudas, and other potentially dangerous sea dwellers, but the animals generally don't care much about humans. They’re even less likely to approach if the workers are using torches.

8. THEY SOMETIMES SWIM IN UTTER FILTH …

A common component of commercial diving, HAZMAT (hazardous material) diving involves working in contaminated water. That could mean anything from a lake affected by nearby lawn chemicals to checking equipment at a nuclear reactor. If it could kill or poison you, a diver has probably swum in it.

This kind of work requires a special approach. Brian says that those who venture into higher-risk HAZMAT diving usually wear a positive pressure diving helmet; since the pressure inside the helmet is greater than the pressure in the water outside, the helmet helps keep hazardous material from entering. HAZMAT divers also wear a rubber dry suit that fully seals the diver's entire body, unlike normal wet suits, which allow water to make contact with the wearer. Support staff will also decontaminate the HAZMAT diver after the job, scrubbing their suit free of harmful materials before the diver undresses.

9. … INCLUDING SEWAGE.

An overhead shot of a sewage treatment plant
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Those stories you may have heard about people diving into sewage treatment plants to repair equipment? Those would be commercial divers, who occasionally brave the psychological challenge of being submerged in poop. Because it's usually impossible to see in a sea of feces, divers will study reference photos of empty tanks before going in. They'll suit up in sealed dry suits and typically will weigh themselves down in order to sink through the dense liquid; once they're in position, they work by feel. “Both the sewage jobs I dove on, it was repairing a masticator blade,” Mike says. “Picture a giant blender that makes solids less solid. I don't do it anymore because of the health risks.” A rip or tear in a diver's suit can introduce a litany of dangerous bacteria into their body: In addition to your standard Salmonella and Cryptosporidium parasites, such vile muck can also harbor hepatitis, Norwalk virus, E. coli, and assorted fungi [PDF].

10. DAWN SOAP IS A LIFESAVER.

Dawn dishwashing liquid is a must-have on diving expeditions. It can get diving suits and skin free of oil, and can even help divers cope with parasitic pests. When Jeremy was working on a mile-long pipeline near New Orleans, the shallow water resulted in workers getting infested with parasites carried by nutria, a semiaquatic rodent. “The hookworms will dig into your skin, die, and leave a big red mark,” he says. Splashing Dawn soap gets rid of the itch immediately. (If irritation persists, divers might need to seek anti-inflammatory treatment from a dermatologist.)

11. THEY WORRY ABOUT BEING SUCKED INTO A VACUUM OF DEATH.

Divers are frequently in violation of the laws of nature. Humans, after all, were never meant to thrive (or survive) underwater, particularly at more pressurized depths. Many divers fear encountering Delta P, or differential pressure—a vacuum that’s far higher in pressure than their current environment, and is created by intersecting water bodies as a result of opening a channel like a pipe. “Delta P is vacuum-like suction much like you would imagine from when the cabin of an airplane ruptures, but at a much greater magnitude,” Brian says. “It can be very difficult to detect until you are already too close, and can trap the diver at depth or even kill them instantly.” The unfortunate crab in the video above is an example of how differential pressure can ruin your day.

12. THEY SOMETIMES GO DIVING INSIDE WATER TOWERS.

Those water towers you see in populated areas that stand on stilts hundreds of feet up in the air? Townships need to periodically check them for sediment levels to maintain water quality. That’s when they call in a commercial diver, who needs to add "not afraid of heights" to their skill set. “You have to climb all the way up, get into your wet suit, measure the sediment with a ruler, and clear it out with a [suctioning device called an] airlift." Jeremy says. And that's not the only lofty prospect for a diver: Jeremy notes that some oil rigs stretch 100 feet in the air. Divers without seniority may be expected to carry out repairs or work at or near the top, instead of actually diving.

13. THEY CARRY KNIVES.

A diver straps on a knife
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No, it’s not to duel with sharks. “While diving, I carry a razor-sharp knife for emergency purposes only,” Brian says. In an urgent situation, it could be used for "cutting anything from old fishing line to my own dive umbilical—the air hose and lifeline.” The latter rarely happens, unless the diver gets it snagged or it becomes compressed. In the event of a hose failure, divers have a "bailout bottle," a supplemental tank they can switch to in case of emergency.

14. THEY CAN BE UNDERWATER BUT NOT ACTUALLY IN THE WATER.

A diver works with a torch underwater
iStock

Not every dive requires divers to swim while working. For jobs that require meticulous attention to detail for repair or where welding is required, diving teams can set up positive pressure habitats that isolate the problem area and allow the diver to work out of water. “You use air pressure to push water out of the habitat, which is in two pieces,” Jeremy says. Inside, a diver would trade their helmet for a welding mask. Because it can take a day or more to set up the habitat for a job that might take only one or two hours, habitat work is used only in cases where there aren't any other options.

15. THEY STILL GO SWIMMING FOR FUN.

Like anything done recreationally, diving can begin to seem routine if it's performed on a daily basis. While some divers get their fill of water by working 12-hour days for weeks at a stretch, some still enjoy going under in their free time. “While my career has definitely diminished the novelty of being in such an alien environment, I still love to dive recreationally,” Brian says. “Commercial diving is exhausting work, typically in dark, low-visibility water with a particular task in mind, while recreational diving is often more about exploration and sight-seeing. I would argue that the difference is not unlike a professional runner going on a beautiful hike in their free time.”

13 Behind-the-Scenes Secrets of Dog Show Handlers

Dog handler Kellie Fitzgerald poses with her English Springer Spaniel 'James' after winning Best in Show at the Westminster Kennel Club's Dog Show in 2007
Dog handler Kellie Fitzgerald poses with her English Springer Spaniel 'James' after winning Best in Show at the Westminster Kennel Club's Dog Show in 2007
TIMOTHY A. CLARY/AFP/Getty Images

Every year, roughly 3000 dogs from around the country flock to Madison Square Garden to strut their stuff at the Westminster Kennel Club Dog Show. In all, some 190 breeds can enter the ring, each competing to look and act exactly as required for their breed’s ideal standard. But it takes a lot of hard work from dedicated handlers to produce a dog that can compete with the best of them. “What you see at Westminster, that’s the very final touch,” says Karen Mammano, who handles dogs with her husband Sam. “That’s the final product of everything we do.” We talked to a few handlers who have been at Westminster about what goes into training a dog with a shot at Best In Show.

1. The dogs have treadmills.

Among the qualities the judges take into consideration is the dog’s trotting pace. Many handlers put their pups on doggy treadmills set at a certain speed to get them used to keeping a particular trot. “It teaches them foot timing and the right kind of gait we want them to have,” Mammano says.

Some doggy treadmills cost more than $1000. But, according to dog handler Sharon Rives, that’s just part of these athletes’ training routine. “They’re developing their muscles just like any athlete,” she says, “any runner or football player or any athlete that has to train muscles to do something over and over again.”

2. Soup cans might be a dog handler’s best friend.

Judges also look closely at a dog’s stance—how it holds itself while standing still. “It’s kind of their supermodel stance,” says Rives. Every breed has an ideal stance, but teaching a dog to maintain that position while a judge pokes and prods often takes some creative training techniques. According to Rives, when her parents trained dogs in the 1980s, they used to have the dogs stand on four soup cans placed the correct distance apart.

“Everybody has their own way of doing it,” she says. “Now I have what we call stacking blocks, sort of a wooden device with four feet on it for the dogs to stand on and it’s adjustable. I start when they’re puppies with that and they stand on it for a couple minutes and as they get older they spend more time on it, maybe 15 or 20 minutes a day, to help train their muscles and body to remember to stand in that correct position.”

3. The dogs have ridiculously long names.

'Flynn' the Bichon Frise, with handler Bill McFadden, poses after winning 'Best in Show' at the Westminster Kennel Club 142nd Annual Dog Show in 2018
'Flynn' the Bichon Frise, with handler Bill McFadden, poses after winning 'Best in Show' at the Westminster Kennel Club 142nd Annual Dog Show in 2018
TIMOTHY A. CLARY/AFP/Getty Images

Professional pups have very fancy monikers that reflect their pedigree. For example, Rives’s Australian Shepherd answers to “Wiggle” but her full name is “Veritas Sexy and I Know It.” “Typically the prefix of the name is the kennel the dog is from,” she explains. “Veritas is my kennel name, so whenever I breed a dog, every dog has the word veritas in their name.” As for the rest of Wiggle’s full name, Rives says the litter theme was Top 40 Songs, so every puppy had a different song title in its name.

4. Handler cars must be inspected.

According to Mammano, the American Kennel Club inspects handlers’ vehicles before they can be listed as a "registered handler." What are they looking for? A car that could keep a dog alive in the most dire of conditions. “We have a generator, air conditioning, heat, a 30-gallon water tank,” she says. “We have to have fire extinguishers that haven’t expired and a heat monitor in the vehicle so if the air conditioning goes out the monitor knows. We’re pretty much self-contained.”

5. Dog shows aren’t natural.

Handlers are the first to admit that dogs weren’t made to trot around a ring. “Golden retrievers were never meant to run in circles in a show ring,” Mammano says. “They were meant to be out hunting and doing that job and other breeds were meant to be out pulling sleds. So I try and make it as fun for them as possible.”

6. There’s one quick way to get disqualified.

“If a dog bites a judge or a handler or another dog, that’s pretty much it for the rest of its career,” Rives says. “Aggression is not ever acceptable.”

7. You’re not a real handler until …

... you trip and fall in the ring. “I think we’ve all had a moment where we’ve fallen,” Rives says. “That’s always embarrassing. But I think I like to say that’s sort of like the dog show hazing. You haven’t been fully initiated into dog showing until you’ve completely wiped out in the ring.”

She also shares a hilarious story of one of her earliest shows, when she was just 16 years old. “Normally I use hot dogs or string cheese as bait, something I could put in my mouth, and I happened to only have liver that day, which I’m not gonna put in my mouth. I was wearing a suit that didn’t have pockets, but I had panty hose on so I thought I’ll just real slyly stick this in the waistband of my pantyhose under the flap of my jacket and when I need some bait I’ll just break off a little piece. Well, the liver made its way down the waistband of panty hose to my ankle and dog starts licking it. The judge is going, ‘Ma’am, the dog is licking your leg.’ I was just mortified.”

8. Handlers’ wardrobe choices are strategic.

When deciding what to wear for the big day, handlers have to make sure they’re not overshadowing the dog with fancy flair. “You want to dress to compliment the dog’s colors,” Rives says. “If you’re showing a black dog you don’t want to wear a black skirt because then you’re obscuring the dog.”

The more prestigious the show, the better the handlers dress. “We always joke that last week was fashion week for us because we were all trying to get suits for Westminster,” says Mammano.

And for the bigger shows, they invest in nice footwear, not only because they’re on their feet all day, but because their feet and ankles are going to be on TV. Rives is wearing the shoes she wore to her wedding. “They’re little silver ballet flats that have sparkly crystals on the toes,” she says.

9. It’s hard on the body.

Co-owner and handler David Fitzpatrick holds Pekingese Malachy after winning Best in Show at the Westminster Kennel Club Dog Show in 2012
Co-owner and handler David Fitzpatrick holds Pekingese Malachy after winning Best in Show at the Westminster Kennel Club Dog Show in 2012
Michael Nagle/Getty Images

“A lot of my peers have had their knees and hips replaced,” says David Fitzpatrick, a professional handler who works with the Pekingese breed. “You get tired just from being at the show.” And because dogs are always making left-hand turns in the ring, the handler’s left leg tends to take a beating.

10. They have lucky leashes, toys, and rubber bands.

Dog show people are quite superstitious. Fitzpatrick, for example, has a lucky leash. “I have one I’ve been using probably since 2004 because I know many dogs have had great success with it.”

Mammano won’t re-use a leash once it’s been used on a winning dog, opting instead to retire it. And she always wears three rubber bands around her arm to hold her number.

Also, Fitzpatrick says some owners carry around special toys for dogs, similar to the “busy bee” in Best In Show. “Most of these dogs do have a favorite thing and when you go into the ring and you can’t find that toy you do kinda go crazy like ‘Where is the busy bee?!’”

11. The dogs eat whatever they want.

Well, in the ring at least. “I had one dog way back in the early 2000s and all he wanted was filet mignon,” says Fitzpatrick. “He wouldn’t take chicken or liver, but the filet he would eat. So they get whatever they like. Or I had a Pomeranian that only liked potato chips. I had another dog who liked apples.”

12. Chalk and dryer sheets keep the dogs looking sharp.

Show dogs are some of the most pampered, well-groomed dogs in the world, but it takes a lot of work. “Every breed is going to have their own quirky thing they do to make the coat look a certain way,” Rives says. “One handler told me you should put dryer sheets on a wavy coat. Others say you should wash your dog’s coat in Dawn dish soap if you want it to be straight.”

Chalk is often used to make a dog’s coat look whiter, Fitzpatrick says. “Whatever it is to make the dog look better for the show, there’s probably a product out there for it.”

But according to Rives, grooming is a taboo topic among handlers because “people don’t want to share their secrets, and because there are things that are not allowed.” Indeed, too much grooming is considered cheating, so owners keep their tips and tricks to themselves. And if a handler sees another handler crossing the line, they’ll snitch. “It’s a self-regulating sport,” Rives says. “If you see somebody doing something they shouldn’t be, you’d report it.”

13. Best in show doesn’t come with a cash prize.

“You don’t win any money,” says Fitzpatrick, who won Best in Show at Westminster in 2012 with his Pekingese Malachy. “You get trophies and a lot of swag. We came home with bags of loot, but not one penny. It’s not about the money. It’s about competing at this historic event.”

This list first ran in 2016.

8 Secrets of Air Traffic Controllers

iStock
iStock

As the United States enters into the second month of a government shutdown that began on December 22, 2018, federal employee shortages are becoming an increasing problem. On the morning of January 25, 2019, the FAA announced that due to air traffic control staffing shortages along the east coast, they were halting flights into New York City's LaGuardia Airport. It's a potent reminder that while pilots and flight attendants are key to making air travel safe, air traffic controllers—though less-visible—are just as essential in getting you from Point A to Point B.

The Federal Aviation Administration (FAA) employs more than 14,000 of them to choreograph the flow of airplanes on the ground and in the sky, whether that means using radar and other tools to direct aircraft at take off, communicating with pilots about flight paths and weather, or helping pilots land their planes safely. Take a look at these secrets of air traffic controllers to learn about their unique lingo, high degree of job stress, and occasional UFO sighting.

1. Many of them don't work at airports.

When you imagine an air traffic controller, you probably envision someone working in a tall glass tower at an airport. However, many controllers toil at either a Terminal Radar Approach Control (TRACON) facility or at a route center, which may be located far away from an airport.

According to air traffic controller Chris Solomon, who controls planes for the military, controllers in each of the three types of facilities have different responsibilities. “The typical tower controllers get the planes from the gate to the runway and then airborne to within five or so miles of an airport. The aircraft then becomes under the control of the approach controllers [TRACON],” he told the website Art of Manliness.

These TRACON controllers usually control the plane during its ascent and descent from the airport. When aircraft reach an altitude above 18,000 feet, the route center controller takes over, using radar to guide aircraft at cruising altitudes until the plane begins its descent. Then the approach controller takes the reins, followed by a tower controller who guides the plane’s landing.

2. Age is a major factor.

Some air traffic controllers begin their careers in the military, while others apply to the FAA’s Air Traffic Control Academy. But no matter how they enter the profession, they must have good vision, a sharp mind, and the ability to think quickly and clearly under pressure. The FAA requires that applicants be 30 years old or younger when they apply to the job, and controllers must retire at age 56, before most of them experience any age-related mental decline.

3. They have their own lingo.

Inside an air traffic control room

Pilots and air traffic controllers around the world must speak English to communicate (it's required by the International Civil Aviation Organization), but they also have their own flight-related language. This phonetic alphabetic and numerical system, which replaces letters (A to Z) and numbers (zero to nine) with code words, minimizes confusion and misunderstandings between air traffic controllers and pilots.

For example, controllers say “bravo” instead of the letter “B,” “Charlie” instead of the letter “C,” and “niner” instead of the number “nine.” (Theories explaining the origin of the code word “niner” differ, but aircraft enthusiasts speculate that the extra syllable differentiates it from the German word for “no” or distinguishes it from the pronunciation of the number “five.”) Air traffic controllers also have their own slang and, for instance, use the phrase “souls on board” to refer to the number of people on a plane.

The phonetic system is spelled out in detail in the FAA Order 7110.65 manual [PDF], along with other key code words, phrases, and procedures. Controllers call the manual their "bible," study it during training, and review it regularly to keep apprised of any updates and additions.

4. Pilots with heavy accents can frustrate them.

Although English is the official language of aviation, not all pilots speak it well. Air traffic controller Brandon Miller, who works for Potomac Terminal Radar Approach Control (TRACON) in northern Virginia, tells Mental Floss that it can be difficult to communicate with foreign pilots. “However, we are in the business of communication,” he says, explaining that learning to solve potential communication issues is part of their training. When talking to a pilot who has a heavy accent, controllers may speak more slowly, enunciate words more dramatically, and try to avoid changing routes as much as possible.

Stephen, an air traffic controller with the FAA, echoes Miller’s point. “We mainly just bitch amongst ourselves, say things very slowly, and do the best we can” when dealing with pilots who have heavy accents, he wrote on Reddit.

5. They alternate between stress and boredom.

An airplane and an air control tower

Because they’re responsible for thousands of lives 24 hours a day, 365 days a year, most air traffic controllers experience a high level of job-related stress. “We often miss birthdays, we work on holidays and weekends, and often operate on alternative sleep cycles,” Miller explains. Staying focused is essential, especially during times of busy traffic and bad weather, so most air traffic controllers take a break every hour or two, depending on the rules at their facility.

According to Miller, the diversity of tasks in his work day keeps his job challenging. At any given time, he may be directing Air Force One or other VIPs (from our country or a foreign one), sequencing commercial passenger jets into a variety of airports in the Washington, D.C. area, assisting police or paramedic helicopters, expediting military fighters and military transport planes, or looking for suspicious aircraft in the Washington, D.C. Special Flight Rules Area.

On the other hand, graveyard shifts and periods with less traffic can be tedious and dull. “Hours and hours of boredom combined with moments of sheer terror, as we like to say,” Stephen told Reddit. “But if you like the challenge and want to be where the action is, it's a great job!”

6. They're probably overworked.

In a 2011 article for The Daily Beast, Bob Richards, who worked as an air traffic controller at Chicago O’Hare International Airport for more than two decades, described his job as “thrilling, fulfilling, and utterly exhausting.” Richards noted that four of his coworkers died of sudden cardiac death, two died of pancreatic cancer, and many others suffered from stress-related gastrointestinal illnesses. In his early 40s, Richards himself suffered from atrial fibrillation, which eventually progressed into congestive heart failure.

A secret study conducted by NASA in 2011 found that almost one-fifth of controllers made significant errors, partly due to chronic fatigue caused by their lack of sleep and busy shift schedules. To combat fatigue and address controllers who were allegedly asleep on the job, the FAA issued a series of new rules that increase the mandatory time between controllers’ shifts.

7. UFO sightings definitely happen.

A screen showing radar

During the course of their careers, most air traffic controllers have personally spotted (or have a coworker who has spotted) some sort of unidentified flying object. UFO sightings are more common at night, when air traffic controllers may see an unexplained blinking light that doesn’t appear to be coming from an aircraft. But strange sightings aren't necessarily alien life forms—radar is so sensitive that it may pick up items such as clouds, a flock of birds, or even a large truck on the ground.

8. RObots won't be replacing them.

Commercial aircraft landing

Although air traffic controllers rely on radar and other technology to do their jobs, they’re not in danger of technology replacing them any time soon. With so many lives at stake, air traffic control will likely always require humans to ensure that automated systems function properly and technology doesn’t malfunction. And controllers enjoy the sense of satisfaction that comes with using their knowledge and skills to help passengers get from point A to point B safely. “There is a great amount of pride that my coworkers and I take knowing that safety of air traffic control is the last thing on passengers' minds when they get buckled in the airplane,” Miller says.

An earlier version of this story ran in 2017.

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