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If divers ascend too quickly with fish in hand, that organ will swell and push the stomach out of the creature’s mouth. Typically fishermen will deflate swollen fish by puncturing them with a needle.

“I'm an aquarium guy, so I don't like to poke holes in fish if I can avoid it,” says Bart Shepherd, director of the Academy’s Steinhart Aquarium.

These are gelatinous animals that typically swim around hoovering up plankton.

The big question now is if deep reefs face the same crises as shallow ones: the coral bleaching, the overfishing, the pollution.

Divers already find fishing lines caught up in these deep reefs. “One of the most disconcerting things I've ever seen on a dive was a folded up, used diaper sitting on the bottom at about 330 feet,” says Shepherd.

If you’re not one of the handful of people in the world trained to dive 400 feet deep (where the pressure is nearly 200 pounds per square inch, by the way) for seven hours at a time, this is your glimpse at one of the planet’s least-understood ecosystems.

What makes this all possible is a device called a rebreather.

“If we breathe nitrogen, which is what most of the air we breathe is composed of, it makes us drunk,” says Luiz Rocha, the curator of fishes at the Academy.

“And we won't want to be drunk at 400 feet.”The problem is, helium is a wildly expensive gas. “There's a canister on our back that filters the carbon dioxide out, and then we keep breathing the same helium over and over again and add oxygen as we need it,” says Rocha. For all of the lovely technology, though, the divers still run smack into the limitations of the human body.

"I enjoy wearing boots with a heel and heels itself so I would be lying to myself if I said I was OK with someone being shorter than me," says Fahrner.

She lists her height in her dating bio, and has been told by some men that she's too tall for them. "I'd rather them let me know, as it saves us both time." Jordan Maahs, 6ft, says she had "some trouble with the height thing" when she was using dating apps.

As I idly swipe through Bumble, I will scroll through a dater's photos before perusing their bio, searching for a number that might dictate the crucial decision: to swipe left or right?

I'm 5ft8, and I often swipe left (which means no) on men under 6ft. Amber Fahrner, 6ft, says height is at the top of her list when it comes to swiping.

With regular scuba gear, you can last around an hour breathing a mixture of nitrogen and oxygen.

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