Wow that is sooo coool!
Couldnt really make out if the shoreline was animated (thats the bit Im really interested in) but everything else came across nicely for me, even the beat of the sounds.
Loved the chopper effect on the water.
Dont know if your into this or not but the prob with seeing the edge of the hmp underwater (I used to have this too) could be solved by placing a single mesh plane with the same texture under the hmp where the action was so no edges could be discerned and poly count kept down.