DO NOT WATCH THIS IF YOU CAN'T WATCH IT IN 3D
Seriously, the plot is nothing special. Its just another telling of how awful humans and especially white people are and how we like to stomp on things we think are shiny.
The reason to watch this is the 3D effects, and the story is just strong enough that the whole experience is pretty awesome, but without the 3D, don't fucking bother. You won't care for it, I am sure of it. With the effects, it is awesome.
Nothing is worse than The Abyss.