Jack battles these vicious mutants through the island's experimentation centers. Krieger has incorporated his own DNA into the serum, hoping it will give rise to a primal genetic urge in the Trigens to obey Krieger. The primates transformed into what the scientists called Trigens вЂ“ abominable perversions of nature infused with pure homicidal rage. The serum did indeed enhance every facet of the primates' abilities that Krieger expected but at a price. He has been testing the serum on non-human primates such as chimpanzees and monkeys. Krieger has been developing a mutative serum designed to enhance the intelligence, strength, speed, endurance, and natural fighting ability of living things. It is revealed that the island's scientific facilities are in fact part of an elaborate experiment involving adverse genetic modification. Doyle informs Jack that he was a head scientist on the island, and has recently been tracking the activities of a man named Krieger, who has been secretly and illegally performing twisted biological experiments, and hired the mercenaries to protect his assets and make sure that no one finds out about his studies. Jack eventually manages to infiltrate several research facilities and discovers some unsettling information. With Doyle's assistance, Jack travels across the various islands, battling the mercenaries and digging up intel in search od Val. He discovers an audio-video PDA, through which he contacts and receives help from a man who calls himself Doyle. There he finds that the mercenaries are searching for him. With his only friend lost somewhere in the depths of the jungle, he must now rescue Val and find his way back to civilization.ДЄfter escaping yet another attack, Jack awakes inside a decrepit, almost century-old Japanese fort. Jack manages to escape with his life but is stranded in the remote tropics. As Val reaches the beach, Jack's boat is suddenly destroyed by a missile in an attack from an army of mercenaries on the island. They approach the islands, and soon Val leaves for shore on a Jet Ski while Jack anchors down the boat. He is hired by Valerie Constantine, a reporter, to secretly take her to a chain of uncharted islands in Micronesia to supposedly study its little-known World War II ruins. Jack Carver has long since left his mysterious and bitter past in the Special Forces behind him and abandoned society to run a private boat charter business in the South Pacific.

Jack Carver and Valerie Constantine arriving in Micronesia.

Far cry 3 dinosaurs