Oil prospectors Rolf and Robert travel to an outpost in a jungle on the
island of Mindanao. A rough landing damages the
Cessna charter plane. Robert and Rolf find the abandoned remains of the original prospecting camp. They then find a rotting corpse and determine the prospectors were massacred by natives. Later, a member of the team, Swan, goes missing. The prospectors and their pilot Charlie go into the jungle, and the pilot is killed by a trap. Robert and Rolf then see Swan's remains being eaten by cannibals. After building a raft to float down the river to return to the airfield, the men are separated when the raft is destroyed after traversing rapids. Robert, lost in the jungle, eats poisonous mushrooms, which causes him to vomit and pass out. He awakens to find himself being poked and prodded by the cannibals. Robert is then taken to a cave inhabited by the native tribe. He is tied to a rock and stripped down to his underwear by the natives. A native woman, Pulan, tears his underwear off, exposing his genitalia. The natives grope Robert before attaching him to a pulley and dropping him from the top of the cave until he passes out. Robert spends the next several days imprisoned in a small cave, abused by the natives and fed rotting
offal. When asking Pulan for a bowl of water, she instead forcibly masturbates him. He continues to observe the natives living their daily life, which includes eviscerating, cooking, and eating a crocodile. Robert realizes he is being kept as bait for crocodile hunting, spurring him to escape and kidnap Pulan. The two wander through the jungle until Pulan runs away. When Robert catches up to Pulan, he beats and rapes her. The two then find Rolf, who has been living in a cave and has a gangrenous wound on his leg. The three of them wander through the jungle until they reach the landing field. The cannibals chase them and kill, cook, and consume Pulan. After Rolf is hit in the chest with a spear, Robert fights and kills one of the cannibals with a spear laced with cobra venom. Robert then eats the native's liver to frighten the other cannibals. Robert and Rolf then manage to make it to their plane and fly off; it is implied Rolf dies from his chest injury soon after takeoff, collapsing on the seat of the airplane. The postscript states Robert Harper quit his job as an oil prospector, got married, and moved to a "small farm" in
Mexico. ==Cast==