ocean tunnel

hi guys,#we are thinking of doing a bit of an overhaul of our ocean tunnel and am hoping to get some ideas from those of you who have seen plenty of them.
Ok just a bit of background: it is a marine tunnel with water pumped straight up from the Atlantic ocean, so will need to have fish that can handle cold. It is also not a huge tunnel, so no very large animals can go in there.
We are thinking more along the lines of non living things (i suppose you could say 'decorations') that could spruce the place up, or displays or something. i saw Londons 'belly of the whale' idea and thought that was brilliant, so would like to come up with something just as good without copying them!
thanks
:)
 
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