Beneath Australia's tropical waters lurks the box jellyfish, killing more people in the tropical north than sharks and crocodiles combined. Join Adventurer Ben Cropp as he investigates the marine stingers that inhabit the oceans off northern Australia. The deadly box jellyfish inflicts agonising pain and has killed as many as eighty people. During the hot months of Australia’s summer the oceans along the northern coastline look inviting but swimmers take a huge risk by entering the waves. Many beaches have specially netted enclosures to keep swimmers safe from the box jellyfish, but the nets are not fine enough to keep out the tiny Irukandji jellyfish which is as small as a thumb nail but has been to known to cause death.