Fatal Pressure

S1, E4: The crushing weight of water generates the Underwater Universe's ultimate weapon: Pressure. It has banished humans from much of the world's oceans, only a handful have defied it head on and survived. The deeper man goes, the greater the power of water. The bends, exploding lungs, oxygen toxicity, nitrogen narcosis, and imploding submersibles... Is it possible for anything to survive the deepest place on earth some seven miles down? Answers will surprise. Plunge through five ocean zones, each deadlier than the last, to uncover the mysteries of "Fatal Pressure.