The document discusses Challenger Deep, the deepest known point in the world's oceans located in the Mariana Trench near Guam. It notes key details about Challenger Deep including its depth of 10,923 meters and temperature of 39 degrees Fahrenheit. The document also outlines some of the extreme pressures humans can withstand, equipment needed like scuba gear and submarines, and physiological effects on the body like difficulty breathing and ear pain in such high pressure, low oxygen environments.

1. Challenger Deep hedgehoghead

9. THE END Tim Engstrom