I think it's very true, and possible. The reason that they don't wash up on shore, as bathory has said, is because they aren't made of very durable stuff, lol.

I've read a lot of things like this, and I have to say that I believe them.
I also must say, that I am a jellyfish fan and I think they are beautiful! These really big ones are no exception. Although I hate getting stung, none of them will keep me from going in the water.
A question : In the first pic, that is just a normal picture of the Lion's Mane jellyfish right? It's not supposed to be a pic of a giant jellyfish hopefully, because it looks to me like they just took the picture while the diver was farther away from the jellyfish. The second pic looks real though, and very pretty.
Cya!