1														2
										3
																			4
5		6					7			8											9
				10				11													12
13																14	15
16				17
															18
						19		20
																				21		22
				23
24
								25		26			27
		28
	29																30
31												32				33

Across 3. A bathyscaph has a thick metal ________ underneath where people sit. 5. A bicycle pump contains one of these to compress air. 8. Air is ___________ from a submarine to make it sink. 10. An aquarium pump is this kind of pump. 12. A computerized unit which cleans pipelines as it is pushed through. 14. Another word for 'deep'. 16. No longer used in detergents because it is harmful to the environment 20. A submersible that can go to the deepest parts of the ocean. 23. A liquid or powder that can remove dirt from fabric. 24. A submarine floats when it is _____ dense than water. 25. For a sub to re-surface, _____________ air is forced into the ballast. 29. A fish uses a swim _________ to change its buoyancy. 30. Pipeline pigs contain these to check the pipe and record its condition. 31. A submarine sinks when the ballast is full of _______. 32. Another name for decompression sickness = the ____________

Down 1. A device that moves a fluid through or into something. 2. At ___________ water pressure, nitrogen gas dissolves in a diver's blood 3. Surrounds dirt particles so they cannot re-attach to clothes. 4. Removes stains from clothes 6. Another word for 'ship' 7. An example of a valve in your kitchen or bathroom. 9. A Canadian remotely operated submersible. 11. A high pressure chamber used to cure the bends. 13. This type of whitener adds brightness to clothes. 15. ___________ screw pump moves water from a low place to a higher one. 17. Pushing the _____ in a baall valve, will release air. 18. Air tanks on a sub = _________ tanks 19. A gas that bubbles out of a diver's blood if he ascends too quickly. 21. Devices which control or regulate the amount of fluid flow. 22. Stops detergent from clumping. 26. A submarine sinks when it is _______ dense than water. 27. Removes protein stains from clothes 28. A toilet tank valve is connected to one of these. 33. Self Contained Underwater Breathing Apparatus