The Box Jellyfish (also known as a Sea Wasp) is a very dangerous creature to inhabit Australian waters. The Jellyfish has extreme toxins present on its tentacles, which when in contact with a human, can stop cardio-respiratory functions in as little as three minutes. Contact with only 3 m of tentacles may be fatal for an adult. There are many (about 70) reported deaths that have occurred in northern Australia between November and April.
On March 25, 2012 an American woman survived a serious box jellyfish sting received when swimming in the north of Koh Samui, Thailand. She was hospitalized and medicated. The dermo-necrotic element of the venom killed the skin area and she has had to endure repeated plastic surgery episodes to repair the damage.
Above images can be found here
The Daily Mail reports how Sam Webster, 37, suffered third degree burns and was left with horrific scarring after falling from a banana boat and being attacked by jellyfish. Sam spent the rest of her holiday in hospital and since returning to Britain she has undergone two operations and will need further skin grafts to repair her leg.
Last four images can be found here
More jellyfish stings can be found here