the temperature is just a few degrees above freezing, according to members of the team. The water pressure at the bottom of the trench is about 1000 times the standard atmospheric pressure at sea level. Cameron, an avid explorer, already has 72 dives under his belt, including 12 to film Titanic. He has previously used Russian-built deep-submersibles to go to the bottom of the Atlantic and make a documentary about the wreckage.