It is approximately 1,500 miles long. The deepest portion of the Mariana Trench is the Challenger Deep, a narrow portion at the southern end, which is roughly 36,000 feet deep. The water temperature in this area is slightly above freezing. The world's ocean trenches remain largely unexplored due to the immense pressures at such depths.
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For other uses, see Gnt (disambiguation). GNT is a Brazilian cable/satellite television channel. Originally launched as GNT: Globosat News Television, a news and information network. With the launch of GloboNews, in 1996, the GNT acronym became meaningless, and the channel was focused on documentaries and talk shows.