You could always use a rig and animate in front of a bluescreen. Then composite it all together later. Or you could build a complete underwater environment and just use masking, though it gets harder if you have many elements, because masking around fish and things can get difficult.
Sloth did a pretty cool rig for fish, and I'm sure it would be possible to do something similar for minifigures too:
Fish swim rig by Chris 'Beard', on Flickr
Last edited by rioforce (April 16, 2015 (05:31pm))
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