Just look on the internet - here is what I found by just typing in the word. (Use to make all sorts of mini worlds in old shoe boxes). How to Make a Diorama - eHow.com Make a Diorama A diorama is a mini-world -- an entire landscape in a box, carry ca...
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and tells how to make a diorama. Since the *top* of the zone is 200meter down, I suppose your box will be deep blue or black inside. I suppose appropriate fish, etc. would be inside on strings or wires.