>At 332 meters, this is the deepest any human has ever scuba dived. Set by Ahmed Gabr in 2014. Yes. It took him 12 minutes to descend to depth... and 15 hours

>At 332 meters, this is the deepest any human has ever scuba dived. Set by Ahmed Gabr in 2014. Yes. It took him 12 minutes to descend to depth... and 15 hours to ascend. But if you take a look at the wikipedia article for deep diving you'll note there's a record for a "simulated" dive that's much deeper, 701 meters, done in 1992. Simulated how? Why was it never repeated? Well... https://web.archive.org/web/20180127104927/http://gtuem.praesentiert-ihnen.de/tools/literaturdb/project2/pdf/Gardette%20B.%20-%20EUBS%201993%20-%20S.%2032.pdf https://web.archive.org/web/20180127104927/http://gtuem.prae... >Hydra 10 was performed in the Comex hydrogen hyperbaric facilities in Marseilles by three professional divers. >The dive protocol included: 4 weeks of pre-dive period, 2 day of confinement at 10 msw, 13 days of compression to 675 msw, 3 days of bottom stage between 650 and 675 msw with an excursion dive at 701 msw, 24 days of decompression with 8 working dives in wet chamber. How were the accommodations? >A 35 m^3 cylinderical chamber (internal diameter: 2.3 m - length: 9.35 m) with living area and sleeping quarters and sanitaires. Cozy. Spending 42 days in a steel can pooping a foot away from two new best friends must have been interesting. Did they have fun, at least? >At 650 msw (6.6 MPa) and deeper, we particularly observed: >- An increasing HPNS with: slight tremor, myoclonia, mysmetria which induced psychometric and intellectual performance decrease. >- A dyskinesia associated to proprioception troubles with muscular weakness. >- A decrease in appetites which required a change in the divers nutrition. >- Sleep disturbance with decrease of deep sleep phases.