Actually, I believe the flooding would go beyond the pit through the subway tunnels, if the bathtub was compromised. I'm sure this has been considered and contingencies or protective measures instituted. At least I would hope so.
It's always been a question mark. There's no way to assess the damage to the wall without moving the wreckage, and the wreckage may be the only thing keeping the wall in place.
Hopefully, they'll be able to plug these leaks before the thing crumbles.