Boa... Nguu yak! (2006)

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. Soon, the group finds out the terrible thing deep inside the cave- it's a ferocious and enormous boa that wants to swallow all of them as its food! The only way to survive is to approach it when there's no way to escape from its mouth.