I have a walled off cave as part of my hermitage, and I am starting to run out of cupboard space. I read that caves/underground layers do not have decay so I was thinking of using that 50 or so tiles of unminable area as additional storage space (as opposed to building a new house or two). A majority of that unminable area is outside my walled compound, and my question is whether or not someone planning on raiding me would be able to build a mineshaft leading to my unminable storage area?
I initially planned on walling the outside entrance to my cave to seal in my hermitage from theft, but decided to wait it off to seal off the front area in the cave at the minable border (50 or so tiles from the entrance) to allow for a lot extra cupboard space. I havent started building the walls yet but have the materials ready. Before i set the walls and start piling in cupboards, I would like to know if someone would be able to build a mineshaft that will connect to that storage area from up above? I can wall of that portion of land above that cave entrance, but dont have all the mats to do that yet, so I figured id ask on the forums while I gather the mats.
TL:DR
Can a mineshaft be built above the cave to lead to the 50 or so tiles of unminable area of a cave entrance?