. . _:b670488758 . _:b670488758 . . _:b670471470 . . _:b670471470 . "A submerged bed which underlies a marine water body."@en . _:b670471470 . . _:b670471470 . "marine bed"@en . _:b670488758 . _:b670488758 . _:b670488758 . . "sea bottom"@en . _:b670471470 . .