During lock-down, it dawned on me that I have, at last, completely run out of figure storage space, with every corner of the house currently packed with miniatures. Nil desperandum, dear viewer! I've decided to extend the BigRedBatCave by excavating a new "dungeon level". The first step is to install a trap door, which you can see marked out, above.
Above you can see the initial hole cut, exposing the beam, and below the reinforced hatch.