Mariana Trench

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The Mariana Trench is the deepest part of the oceans at over 36,000 feet deep. Little light reaches these depths and animal life is sparse. Temperatures decrease with depth to around 3-4 degrees Celsius at 6,600 feet. Humans can only cope for around 5 minutes at depths over 200 feet due to effects on the respiratory, cardiovascular and ear/sinus systems. Special equipment like diving suits, breathing apparatuses and surface supplied equipment are required for deep diving.

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Sea water is approximately 800 times more dense than air. Therefore, it exerts much greater pressure on the body of a diver. The weight exerted by the atmosphere on an area of 1m2, is approximately 10,000kg at sea level. This value of pressure (10,000 kg m-2) is thus referred to as 1 atmospheric absolute (1 ATA), or 1 atmospheric pressure. For every 10m(~32feet) below the surface a person dives, he is subjected to an additional pressure of 1ATA. Therefore, at 30m, a diver will experience a pressure of 4 ATA (1 ATA exerted by the atmosphere, & 3 ATA exerted by the 30m of water above him).

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