2Cold4
Not quite, the response I expected but allow me to tie up the loose ends for you with a bit of our diving history and why I made my original suggestion before you ridicule us further.
For this recovery no one advocated scuba diving, for my part the suggestion was to move it off a scuba forum and save all the chaff. But I am happy to follow up my original post to the OP with some hard fact and experience.
1. Below is a YouTube link to Acergy Diving working happily at 278MSW (912FSW) in 2009 from the DSV Acergy Harrier. Being that 278 MSW is around the OP's target 900 foot depth it is one option but at a huge unrealistic cost.
2. Also note the yellow SLS system and the Gas Services sticker for reference later.
3. Acergy Diving have now been taken over by SubSea7 but before that Acergy Diving were originally formed from a company called Stolt Nielsen ( I was a diver back then on the Seaway Swan 1980's) Stolt also took over Comex and became Stolt Comex Seaway.
Prior to this 1979 another company I worked for was Sub Sea Services they were using a divers reclaim system I also worked on designed by Al Krasberg on the vessel MV Oil Endevour in 408FSW in the North Sea BP Forties Bravo. Back then Don Rodocker who I suggested to the OP worked for Krasberg.
Don left and developed his own reclaim system together with a company called Development Engineering a secondary support system or SLS the company back then was called Gas Services, the self same name as the sticker you see at 912 feet seawater in the video below. Prior to this he and Chris Delucci with a company called Saturation Systems built the stainless diving helmet I commented on Akimbo's avatar. (Unless its the Siebe Gorman Sea Crown prototype LOL)
Although it is said we learn nothing from history at least do us old timers the grace to hear our feeble comments. Besides as you say "pressurised to the limits of human anatomy what we can still do that a robot or exosuit or sub can't do is
If nothing else enjoy the music. All the best Iain Middlebrook
Deep Saturation Diving - YouTube