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Modern deep-diving equipment has been improved to permit descents to very great depths, such as the U.S. bathyscaphe, Trieste II, which descended to 35,798 ft (10,294 m) in the Marianas Trench in 1960. Smaller, remote-controlled craft, such as the Jason, which was used to examine the sunken steamship Titanic, explore natural and humanmade underwater structures. Deep-diving craft (see submersible ) provide invaluable direct observations of the deep ocean bottom, mid-ocean ridges, and marine life. Recent oceanographic studies include drilling of the seafloor (see Deep Sea Drilling Project ).
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