Possible Clues:

• To a large extent there's a sound c.c. of them
• See the sound of the sea and con them
• Where canoes capsized?
• Pacific, Atlantic
• Is 22 down over them as a rule?
• Indian is one of these announcing topless draughts
• Don't start listening to proposals for lots of water
• Atlantic, Pacific etc
• Pacific and Indian
• Tons and tons