This photograph is doing the rounds on the internet lately. The floating creature is a Lion's Mane Jellyfish, a real creature but this photo is a fake. The diver has been photoshopped in to make the jellyfish seem huge.
This manipulation makes me mad. It seems to suggest that nature is not amazing enough by itself, it needs to be meddled with. But nature is plenty amazing enough already. The Lion's Mane Jellyfish can get to be nearly 8 feet in diameter. This ought to be enough for anyone, and with their streaming stingers they can be up to 120 feet long.