Dirt Dauber (2009)

A man awakes naked and confused in a isolated mountainous region and soon encounters a strange local who offers to help him The helpful stranger tells the man of local folklore that speaks of a murderous religious cult a train tunnel cut deep into the mountain that leads to nowhere and an insectlike fertility god that is said to dwell within it The two men soon go underground in search of the truth and find themselves in a stygian black temple of horror