A: The deepest part of the ocean system is the Mariana trench in the Pacific Ocean. First pinpointed in 1951 by HM Survey Ship Challenger, this trench is 1,500 miles long, averaging over 40 miles in width having maximum known depths of over 35,000 feet. On January 23, 1960, the manned US Navy submersible vessel Trieste descended to the bottom of the trench for the first time. On March 24, 1995, the unmanned Japanese probe Kaiko also reached the bottom, recording a depth of 35,797 feet, the most accurate measure of the trench ever made.
Friday 2 January 2009
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