Instinct

Hidden in a remote corner of the South American jungle is a clandestine research facility known simply as Meros. Here, working in laboratories buried a thousand feet underground, military scientists have developed the most astonishing and deadly weapon known to man... Meanwhile, on the other side of the globe, a Chinook helicopter lands a highly trained squad of special forces soldiers deep in hostile territory — their mission: to clean up a black-ops killzone. As they enter the cave, they hear the faint buzz of the weapon — like the beating of a thousand pairs of insect wings.