This is probably one of the few times I will publish a higher resolution picture on the web, largely because it makes seeing the sea snake easier. While I personally wasn’t afraid of the snake, because I know they would have to bite you somewhere fairly “soft” to inflict lethal damage, the guide started to freak  when this snake got a little “too close for comfort”. I basically took this snap with my Olympus underwater cam, then was whisked away a few seconds later.

Update: I found out this is known as a Banded Sea Krait.