Answer: submerge

AnswerCrossword Clue
SUBMERGEGo under
SUBMERGECover with water
SUBMERGEOverwhelm.
SUBMERGEPlunge.
SUBMERGEInundate.
SUBMERGEGo down, as the Seawolf.
SUBMERGECommand aboard the Nautilus.
SUBMERGESuppress.
SUBMERGESink.
SUBMERGEPut under water
submergeCause to be under water
submergeDescend below the surface of an area of water
submergeCompletely cover or obscure
submergeto place below the surface of a liquid, also SUBMERSE