Really interesting, to me at least.

Considering the title, there is limited amount of content actually showing deep sea marine life. Too much of the documentary covers the bright eyed marine biologists and their wide mouthed reactions to what we'd rather be viewing. As well as neophyte scientific speculation by Cameron that seems to displease his colleagues more than anything else. You could say he was..in too deep..maybe, in over his head..or perhaps, out of his league?

Most interesting.

I enjoyed the visuals but I despised the dialouge and allusions to what life might be like on other worlds.

Thought this one was pretty dull and slow. If you'd watched the Discovery shows that have a similar plot... then don't watch this as it seems they have rehashed the same material with a TON of needless jargon-laced filler.