Why teleport to bunker door?
They didn't know where the warp was gonna send them, and made the theory that it could send anywhere they'd think.
First, how can the bunker entrance be the place they best remember? Anywhere that marked their lives would fit better!
And why go there, where milicos could be waiting and in the middle of the snow with nothing to heat them? If they could choose anywhere, they should at least go home, somewhere safe, where they could be protected and tell the world what they found!