Make a bunker that can withstand an environment of extreme ambient temperature. It can not use elements which transfer no heat at all (i.e. insl, frme, etc). Most of the bunker should be of meltable or burnable elements.

To test the bunker, turn on ambient heat and put "sim.ambientAirTemp(#)" into console without quotes (amd # replaced by a high number). The higher the number you can put for ambient without melting the bunker, the better it is.

A decent bunker should be able to withstand at least 9999.