Nope, in this case the bunkers stored the launchers and other equipment, while the missiles were stored underground. This is an aspect based on the real life counterpart base.
This lore on Tisy is based off of the real life Czech military base called "Klondajk", that during the 80s did indeed house nuclear warheads of a minor proportion. So this lore being considered a way for my group to have nuclear weapons in Chernarus is false, simply because all of this lore is purely based off of the real life counterpart of Tisy.
Yes, I'm naturally interested in this base because of that but you'll notice in the lore that I specifically state that the base's underground stores are sealed. There is absolutely no physical way anyone will ever get into it. Plus, finnr explains well that we've never said we had nuclear or even alluded to it.
All I'm trying to do here is fill a gap in the lore on a large base that's history is mostly unknown.