You have some pretty nice shots there! Every shot seems to have something new going on, my favourite being the very first one and the one where they"re swimming up to the surface. The story is also nice. One thing, maybe try using a higher frame rae like 12 or 15 frames per second to make it look a bit mor fluid. All in all still well done, especially for the short amount of time with SHAC. Good luck at the contest!