  This talk reviews our recent work showing how tiny black holes can act as
nucleation sites for the decay of the metastable Higgs vacuum. We start by
discussing the formation of thin wall bubbles of true vacuum inside a false
vacuum, and show how adding a black hole lowers the action of the Euclidean
tunneling solution, thus strongly enhancing the probability of vacuum decay. We
then review numerical results for the Higgs vacuum showing that the decay rate
is even higher for these "thick wall" bubbles. The results imply either tiny
black holes are not a component of our universe, or BSM corrections to the
Higgs potential must stabilise our vacuum.
