The document discusses the extreme environmental conditions of the deep sea including lack of oxygen, high water pressure, and lack of sunlight below 66 feet, and the effects this can have on the human body such as collapsed lungs, cardiac arrest, blackouts, and decompression sickness. It also notes that to survive in these conditions one would need to wear a helmut diving suit made of canvas and rubber along with lead boots and weights on the chest to maintain equilibrium while breathing from an oxygen tank.

1. Extreme Environments The Deep Sea

2. Environmental Conditions Lack of oxygen Water pressure No sunlight beyond 66ft below water

3. Effects on the Body Collapsed lung Cardiac arrest Blackouts Decompression sickness

4. What to Wear Helmut diving suit made of canvas and rubber Lead boots and weights on chest to maintain equilibrium Oxygen tank