The wreck is lying at the bottom of the sea.

沉船躺在海底。

《牛津词典》

The ship was buried, beyond retrieval, at the bottom of the sea.

船已葬身海底，无法打捞。

《牛津词典》

Sea cucumbers are strange animals living at the bottom of the sea.

海参是生活在海底的奇怪动物。

youdao

The area then was at the bottom of an ancient sea.

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Russians and Americans playing chess peaceably, seemingly and inexplicably at the bottom of the sea.

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Whichever comes out on top, though, it is clear that astronomers believe there is treasure to be found at the bottom of the sea.

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Riding the dark ocean in the pitch of night before all hell breaks loose, sending up a cloud of heavy black rain and fire, throwing heavy equipment into the icy water, casting men to their deaths at the bottom of the sea.

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