I got myself out. I put my back against the wall next to the "basement" door, crouched, and held down the "S" key (walk backwards) all while equipping and holstering my mosin a few times and I walked right through the wall. I then went back into the house and logged back out. I returned yet again underneath the structure and then repeated the walking backwards, crouched, and equip-holster weapon and it worked again. =)