a friend of mine and comment on your video noted "this song really does make me feel like i'm drowning, it takes my breath away." and honestly, that's accurate.
other comments mention that it takes a while to build up but i'm honestly in support of that -- anyone who's ever held their breath underwater can attest to the fact that it really is a building panic, and you've encapsulated that well. furthermore, the slight power decrease throughout the song's peak, before exponentially fading to nothing but water, makes that effect a hell of a lot more terrifying. even the addition of the film rolling, which i see as one's brain cycling through memories in its final moments, adds much more impact to that; though, it is definitely a bit loud.
i'll admit that drowning is a touchy subject for me, so that's as far as i'll go. but from a critical standpoint (my favorites admittedly lie elsewhere,) this is your best work, perhaps second to windglass -- but it's awfully close.