Steve Backshall finds himself in deep water as he goes in search of underwater animals for his Deadly 60 list. The waters off the coast of Borneo hide a wealth of lethal predators, but just who is worthy of a place on the list? Steve comes face-to-face with a highly venomous scorpion fish and witnesses the formidable spear-mantis impaling its supper with its retractable spear-like arms. Just when Steve thinks he has seen it all, he finds himself surrounded by a gigantic shoal of barracuda.