Harrison - Underwater -

Despite the trauma of being the sole survivor, Harrison eventually faced his fear of the water. In 2015, he became a professional diver himself, trained by the very team that had rescued him from his "underwater tomb".

: Because Harrison had been at that depth for so long, his body had become "saturated" with pressurized gases. Bringing him to the surface too quickly would have been fatal, so he had to be transferred to a diving bell and then spend another 60 hours in a decompression chamber. Life After the Depths Harrison - Underwater

: With no food and thinning oxygen, his only sustenance was a single bottle of Coca-Cola he found floating in the wreckage. The Miraculous Rescue Despite the trauma of being the sole survivor,

: For nearly 60 hours (about three days), Harrison survived in complete darkness, wearing only his boxers and a singlet. Bringing him to the surface too quickly would

If you'd like, I can find more from the divers who found him or details on the physics of the air pocket that kept him alive.