A 29-year-man, wearing a full-body "stinger suit," was stung on the face by an Irukandji jellyfish while diving from a yacht off the coast of Australia. They can kill a person in minutes.
The jellyfish's sting can lead to "Irukandji syndrome," a set of symptoms that includes shooting pains in the muscles and chest, vomiting, restlessness and anxiety. Some symptoms can last for more than a week, and the syndrome can occasionally lead to a rapid rise in blood pressure and heart failure… because the jellyfish leave almost no mark on their victims, scientists believe they are responsible for many deaths that were attributed as drownings or heart attacks…
Australian dives face-first into deadly peanut-sized jellyfish
Photo Irukandji-jellyfish-queensland-australia.jpg by GondwanaGirl from Wikimedia Commons released into public domain.