[ibol]

hey, guys, just so you know,
this has been addressed in update 115 (currently in beta)
I apologize for those losses, they are not intended.

rubble no longer spawns in doorways that prevent you from returning. (same thing goes for short-circuit traps)
also, high level of "spelunker" skill will now remove rubble, and there's an artifact and a suit that do it too!