For what it's worth...
It seems like there is a delay from the time the ufo enters the water to the time of the splash.
The two jets which pass over it seem to dissapear before they leave the shot (this could be camera anomoly).
The ufo's downward movement is similar to other cgi videos in that it is smooth.
However the presence of a chopper and the general vibe is pretty genuine.
Thanks for sharing.
EDIT: haha! Sounds like at last minute he is shouting "Obama!"
The very last second or so

Some people on the comments are suggesting 4 planes.
Some are suggesting a link to a film.
[edit on 29-9-2009 by and14263]