“The pressure hull was designed so that it would fit in the pressure chamber,” he says. “It was absolutely at the limit of what would fit.” A dive of 14,000 metres was then simulated. While this depth is 20% deeper than the deepest point on earth (the Challenger Deep stands at 11,000 metres) it is a requirement for submersibles intending to dive the full ocean depth multiple times. Needless to say, Limiting Factor passed the test, becoming the only submersible in the world certified to dive to 11,000 metres an unlimited number of times. here