By the way, most of the really deep water fish are collected on closed circuit rebreather initially made famous by Richard Pyle. There are still decompression obligations but they are more easily satisfied.

Welcome and thanks for the wiki link. It is pretty amazing and yes from what I understand a hard days work. Unfortunately a few diver’s do die each year when pushing to extreme depths. But with proper training it can be done successfully as shown by the few pros that are out there.

Mark Ellyatt, a British technical diving instructor, set a new world record for the deepest scuba dive when he descended to a depth of 313 meters (1,026.9 ft) off the island of Phuket in Thailand, beating the previous record by about 5 meters (16.4 ft). No independent verification of the record was immediately available.

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According to news reports, it took Ellyatt 12 minutes to reach the record-breaking depth, but six hours and 40 minutes to decompress and return safely to the surface. The Briton took six tanks down with him and had another 24 brought down by support divers. This dive took 10 years of preparation

So while 100m isn’t that bad, it still must take a really long amount of time to get down, find some fish, and then slowly go back up to the surface. Not quite 10s of hours, but quite a good day’s work.

At that depth the maximum time these people can be down must be incredibly small, and it must take 10s of hours to get back to the surface safely. Very interesting.

On other thoughts, all these rare fish are pretty amazing. As somebody just beginning to keep a salt/reef tank it takes awhile to appreciate these, but seeing something like the previous Bank butterflies is amazing.