underwater

under|wa|ter /'ʌndərw'ɔːtər/
1 [ADV] ADV after v, n ADV
Something that exists or happens underwater exists or happens below the surface of the sea, a river, or a lake.
...giant submarines able to travel at high speeds underwater...
Some stretches of beach are completely underwater at high tide...
[ADJ] ADJ n
Underwater is also an adjective.
...underwater exploration.
...a retired underwater photographer.
2 [ADJ] ADJ n
Underwater devices are specially made so that they can work in water.
...underwater camera equipment.
...a pool of clear water lit by underwater lights.

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