Assertion: sea slug's part | /r/HasProperty | the mariana trench
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text: This was lowered by cable but by 1960 a self-powered submersible, Trieste developed by Jacques Piccard, took Piccard and Don Walsh to the deepest part of the Earth's oceans, the Mariana Trench in the Pacific, reaching a record depth of about 10,915 metres (35,810 ft), a feat not repeated until 2012 when James Cameron piloted the Deepsea Challenger to similar depths.