21.   The manta ray blended in beautifully with the sandy ocean floor.

22.   A sea devil glided along the ocean floor.

23.   I ducked around the corner of the alleyway and flattened myself against the wall the way a flounder hugs the ocean floor.

24.   The oldest known rocks from the ocean floor come from the western Pacific, but these are only of Jurassic age.

25.   Although the scientists acknowledged that the expeditions produced invaluable data about the configuration of the ocean floor, Grimm alone maintained that they had actually found the Titanic.

26.   And a football coach lauding the punter after a game is like a ship captain congratulating the oceanographer who discovered the wreck of his vessel on the ocean floor.

27.   Another official said divers saw three sections of the fuselage on the ocean floor.

28.   As the sea freezes, it leaves behind very dense, saline water that sinks to the ocean floor and is replaced by warm water from the tropics.

29.   As yet, there is no evidence that Europa has hydrothermal vents on its ocean floor.

30.   At interactive stations, visitors can impersonate a dolphin bouncing sounds off the ocean floor or hear how an operatic tenor singing underwater would sound a mile away.