We recently moved to Utah. Having a basement is a new experience for us. The home we are having built has a large cold storage room under the front patio, which appears to be pretty standard here in UT. The room is more of an "L" shape with the short section being maybe 5' by 10'. I have been playing with the idea of framing in a metal fire/security door to this section to make a gun vault. This room does not have any ventilation. Electrical is already in place. Room is below ground level. Question is, would I be able to maintain a safe humidity level being below ground in a basement? If this helps we are north of SLC and west of I-15. We are not aware of homes around us having issues with ground water. I like the idea of a walk-in gun vault or safe room if needed. Thoughts?