Survey of physicists about the threat of vacuum decay (forum.effectivealtruism.org)

20 physicists discussed a scenario which demands a solar system scale device to initiate a physical phase transition which destroys the universe, and guess what: they don't agree if it's possible.

If it were possible, some fat orange imbecile in a galaxy far far away would already have done it (to own the libs, of course). Therefore, it is not possible.