I had a discussion with a underground milita guy and he told me about his "bomb shelter" for when the world ends (lol i know right) lol.
Here is the question.
Say you want to build a bomb shelter underground.
how far do in the ground would you have to dig, before it didnt put off any heat that was able to pick up from a thermal imaging camera like on governemt vehicles. So no one in the government could know your living down there.