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submersible

noun [C]
 
 
/səbˈmɜː.sɪ.bl̩/ US  /-ˈmɝː-/ specialized

Definition

a type of ship that can travel underwater, especially one that operates without people being in itPassenger, cargo and military shipsBoats and sailing craft
(Definition of submersible noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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