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Hadal science has become one of the research frontiers in earth sciences in recent years. Free-fall vehicle, also known as “lander” has provided new opportunities to investigate the hadal zone. Two hadal expeditions in the Mariana Trench were conducted successively with the support of Chinese Academy of Sciences since last June to this March. Two 7000-meter rating landers named Tian Ya and Hai Jiao...
Unmanned free vehicles, using kerosene-filled envelopes for lift, have been used since the late 1930's to deliver scientific instruments and samplers to the seafloor. Recent advances in glass spherical housings have provided a cost-effective option for operations into ocean trenches. During his 2012 DEEPSEA CHALLENGER Expedition, Explorer James Cameron pushed the design limits with both manned submersible...
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