Board Thread:General Discussion/@comment-26006155-20190820122909/@comment-26006155-20200106032547

We see Sans warp to a dimension where Papyrus is still alive. Other dimension exist. And Alphys has been researching them for a long time.

The implication at the end of the No Mercy route is that other than Chara, the entire world has been erased, destroyed. There is nothing left. No love, no friends. And especially no Core.

While the force fields might keep Chara out of the True Lab, they won't save people inside the lab for the universe being erased. They only way they could survived.. is if they weren't in this particular timeline when it happened.