To get a little deeper in explanation myself and 3 others were doing a Jelly King run from Depth 8 till end. Once we reached the 18th Floor the checkpoint we noticed that the Elevator that takes you directly to Haven was no longer a Haven elevator(1 person joined on depth 9 and just save a haven symbol). It's image was a purple-blue down arrow, above that was a -10 energy cost indicator. Having seen this we all jumped on the elevator expecting to be able to go down another depth in some new exclusive dungeon in which case we all got shoved back into haven.

So.... has anyone else seen something like this and actually got to do the new area or did you just get pushed back into haven? I think the reason why we got pushed back into haven was because the 4th member only save the haven symbol and 0 energy cost.