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Seems excessively very deep to me - someone’s going to have to build a freight elevator as tall as a soccer field is long. Even worse, I’d expect you’d want your airlock on the surface so you’re not struggling to maneuver in a bulky suit just to get outside: now you’re talking about a 100m pressurized elevator.
Does anyone know how deep you’d ideally want? I’m sure NASA has studied it. I do remember reading that 1’ is the exact wrong number because of indirect radiation. While you get more protection from radiation and a more stable temp, the deeper you go, the marginal value probably drops off pretty quickly, plus the inconvenience would quickly climb. When people online talked about living underground on the moon, I always imagined like 5-10m
Edit: here’s an argument to keep it less than 12m deep
Edit2: and here’s an argument for at least 1-2m
I would design the elevator car to be self-contained, rather than pressurizing the entire shaft.
Actually, it would be more like riding in a pressurized moon rover. Then, using wheels or rollers on opposing sides of a track to act as guides, some kind of hoist, or maybe just a linear inductive motor using the track as a stator plate.
The advantage to the linear induction motor is simplicity- if you’re building the track/guides out of metal any way, then, it’s just a few more components and you have a way to go up, go down, and brake.
In any case there’s really no reason to have a pressurized shaft.
The value of the cave is it’s already there, with no need to excavate that incredibly annoying moon dust. Which, to be clear, is a horribly hazardous material.
Because there’s little to no natural erosion, it’s sharp and splintery and highly barbed. It’s also magnetic, so it sticks to anything made of iron or steel; and for example probably causes something akin to silicosis.
It’s basically the reason that NASA and others are looking at pressurized rovers with suit ports for hopping out instead of an airlock and space suit design. It significantly resizes the amount of moon dust coming in.
Yes, the moon dust. That incredibly abrasive moon dust. Getting into the workings of the elevator that is your only way out of a deep hole. Any any repair work complicated by having todo it in a suit, in a vacuum, in the moondust, at whatever height it finally broke down
Even rabbits are smart enough to build 2 exits in their tunnels if they're of any size at all. The weather also isn't a big deal, so a track that's been cleaned, and doesn't have moon dust dragged onto it, shouldn't need cleaning every other week.
Remember, there's not a lot of gravity on the moon, the energy to get in and out of that hole isn't the same as on Earth. You could probably create a tether that could be ridden up and down.
See the link on my first edit. Even in the Moon’s low gravity, a fall over 12m is potentially fatal. It would be foolish to live such that astronauts take this extra risk every day.
You also have to get all your stuff down there in one piece. Sure, more ropes, but tons of equipment, huge sections of living quarters and airlock, construction vehicles, etc. then every supply run needs to get tons of supplies all the way down there. You could do it, but it seems like giving yourself a lot of unnecessary work, taking up way too much time. And of course any sort of cave-in makes any survivors completely unreachable