Survival on Island X

An island has been found and temporarily named "Island X". No country has a claim over the current territory, and that is what the now warlike conflict on the island is about - or used to be. Now it's a game of survival with giant mutant insects, what should be extinct theropods, and others forms of supernatural mayhem. Anymore, it's gangs or bands fighting to survive by scavanging from dropped weapon crates from planes, wreckages of small raft boats, and killing creatures of the island...