The document discusses the extreme environment of the deep ocean. It notes that the Mariana Trench is the deepest part of the ocean at 11,033 meters deep. It also discusses how the high water pressure, low temperatures, and unique gas levels can negatively impact human respiratory, muscular, and nervous systems if divers go too deep without proper equipment. Proper scuba gear, wet suits, oxygen tanks and deep sea submarines are needed to allow humans to explore depths beyond what the naked body can withstand.

1. Deep Ocean: Extreme Environment By: Jim Fields