Boa (2006)

Original title: โบอา งูยักษ์

Fear will entrap you.

A group of teenagers journeys to a remote forest in search of a friend who's been reported as lost after his trip to the forest. While searching, they are caught in a brutal wind storm which blows their vessel into the middle of the forest. The teenagers are forced to seek shelter in a dark cave where, unbeknownst to them, an unusual creature is silently resting.