Capable of being submerged underwater; a small submarine vehicle designed to go deep underwater for exploration or work.
From Latin 'submergere': 'sub-' (under) + 'mergere' (to plunge). The suffix '-ible' means 'capable of.' Modern use as a noun for deep-sea vehicles became common in the 20th century with ocean exploration.
Submersibles have discovered entire ecosystems around underwater volcanic vents that nothing could survive near on land—they've revealed that life doesn't need sunlight to exist! The most famous is probably James Cameron's deep dive to the Mariana Trench.
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