While not as elementally creepy and cool as the first teaser, this trailer for Eli Roth's THE GREEN INFERNO is a fairly effective advert for his CANNIBAL HOLOCAUST homage.
It gets across the central premise of a group of activists who attempt to save a patch of Amazonian rainforest from being laid waste, and are rewarded for their troubles by being taken captive by a feral native tribe. As you can see, there's lots of screaming, escape attempts, and wide-eyed realization of the predicament these kids have found themselves in.
The film has its flaws, such as a goofy male lead (who the rest of the characters inexplicably look up to) and a fairly obvious narrative structure, but the trailers have done a good job of sidestepping those and highlighting what works about the film, which is the creepiness of the tribe itself and the helplessness the group feels once they're imprisoned.
Narrative/acting flaws notwithstanding, Roth put work into this project, and it shows in the mood and atmosphere that you get a taste of in this trailer. Check it out for yourself.
THE GREEN INFERNO feeds on more than your soul on September 5th.