Jen Banbury gives and in-depth description of the life of saturation divers at Atlas Obscura:
When it’s time to enter the chamber (Hovey calls it the “house”), the divers pass through a tight, circular hatch at one end, like one might see on an old submarine, that closes with a “tunk.” The hatch is sealed, and even though they’re on a boat, just feet from support crew and fresh air, the divers might as well be on the International Space Station. Even farther actually: It takes about 3.5 hours for an astronaut to make it back from space. Saturation divers have to decompress for days at minimum. On a dive early in his career, when Hovey was on a job at a depth of 700 feet, he learned that his wife had miscarried. It would have taken him 11 days of decompression to exit the chamber. They needed his salary (not surprisingly, saturation divers are well-compensated, up to $1,400 per day), so his wife told him to finish the job.