  The Standard Model Higgs potential seems unstable at field values $h > h_{\rm
top} \sim 10^{10}\,{\rm GeV}$. Vacuum decay can be triggered by $N\sim
4\pi/\lambda \sim 1000$ overlapped Higgs bosons with energy $\sqrt{\lambda}
h_{\rm top}$. However, this configuration is stimulated by ultra-high energy
collisions with a $\exp(-{\cal O}(N))$ suppression, comparable to spontaneous
vacuum decay: no `Higgspolosion' enhancement arises. This implies that
ultra-high energy cosmic ray collisions are safe, despite that their number (in
production sites) likely is tens of orders of magnitude higher than what
usually estimated (in space). We speculate on how vacuum decay could be induced
classically, forming a in-coming wave of $N$ boosted Higgs bosons at futuristic
ultra-high energy colliders, and on how the resulting vacuum bubble could be
controlled to extract energy.
