Abyss of the Deep

Jaden and his friends decided to go to an art gallery one day. It was all fine and dandy until Jaden decided to explore on his own, finding himself being transported to a different part of the gallery that he didn't expect to see.
He meets two people in this other world, and when they try to escape, Jaden realises only two of them can make it out and back to the real world.
Just who will go on and who will stay?