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.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.