Hello !
I have found wardens key by destroying an obstacle in the URC. Are there many places that must be blown up to acces ? Can't find any but just in case I'm stocking up with explosives. I'll gladly take any help.
Also. Is there a metro network under the main town or other places worth exploring but easy to miss ? I have already found the frozen lake caves and big unmarked bunker in the north east that is zombie free for now.