Could You Dive Into a Jell-O Pool?

Time for a new semi-regular feature! We've been bombarded by wonderful questions from readers, and Matt and Kara and Erin are busy writing them all up. Some of these I'm going to throw open to the group, starting with this one, from Joe Chaudoin:
What would happen to someone if they jumped into a pool full of Jell-O? Would they be able to stand on it or would they sink to the bottom? And if, in fact, they DID sink to the bottom, would they be able to breathe? I just want to swim in a pool full of Jell-O but I want to know the risks.
Please tell me someone out there has filled a pool with Jell-O and has a definitive answer.