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Underwater glider

type of autonomous underwater vehicle that uses small changes in its buoyancy to move up and down and uses wings to convert the vertiical motion to horizontal, propelling itself forward with very low power consumption

Pronunciation
/ʌndəˈwɔːtə ˈɡlʌɪdə/
/ˌəndərˈwɔdər ˈɡlaɪdər/