And no humans aboard...
EXCERPT:
Part of the ROV, diving in the Kermadec Trench, may have imploded under pressures reaching a seam-bursting 16,000 lbs. per square inch (psi). (On Earth, humans are exposed to pressures of nearly 15 psi.)
The Kermadec Trench is the world's second-deepest trench, plunging 32,963 feet (10,047 meters) below the sea surface, second only to the Mariana Trench, which reaches 36,201 feet (11,034 m) beneath the surface of the Pacific Ocean.
The deep-diving vehicle, which operates remotely via an optical fiber tether and also as a free-swimming autonomous vehicle, was 30 days into a 40-day expedition to explore the deep-ocean trench aboard the research vessel Thomas G. Thompson.
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