A remote forested island in the Pacific Northwest, undisturbed for over 20 years, is visited by a group of campers on horseback. The camp tranquility is broken by violence and terror once they discover an old bunker and tunnel complex on the north side of the island and the diseased in-humans that occupy them. An investigation reveals the sinister and disturbing events on a US warship returning from a classified mission to Africa forty years earlier and the evil that has been buried by the government, left to be forgotten by mankind. Until now.