The sea wasp (box jelly fish) is the most most dangerous venomous jellyfish in the world. It is found in the coastal waters of the Pacific Ocean from Australia to the Philippines. It is also been found infrequently in the Caribbean. It is transparent in the water and the tentacles can reach up 6 feet. It is shaped in a form of a box hence the name. The venom from the sea wasp is 700 times more powerful than the Portuguese Man-of-War. People are killed each year from the sea wasp due to the rapid onset of the venom. The venom attacks the respiratory and nervous system in about five minutes causing life-threatening reactions. Needless to say, it is absolutely imperative to seek medical attention as fast as you can.

Sea Wasp (also known as box jelly fish)
Sea Wasp