submarine, submerged, sunken, undersea
English Collins Dictionary - English synonyms & Thesaurus
1 adv Something that exists or happens underwater exists or happens below the surface of the sea, a river, or a lake.
ADV after v, n ADV
...giant submarines able to travel at high speeds underwater..., Some stretches of beach are completely underwater at high tide...
Underwater is also an adjective., adj ADJ n
...underwater exploration., ...a retired underwater photographer.
2 adj 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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