The yacht was anchored 200 meters off the Qeensland coast when Chris Slough dived into the water. That’s when it got him. “I felt a couple of little stings on my chest,” he says, “but I thought nothing of it and carried on”. But as soon as he got back on the boat he realized he was in a big trouble. “I suddenly came over very nauseous”, he says. Within minutes he was in agonizing pain, vomiting and struggling to breathe. “It felt like my organs were popping out”.