The original tour showed this was to be the nuclear power plant, not an ICBM.
Yes, the depot has self-destruct via a thermonuclear device. How do you know? It says so on the side. The instruction manual, even if it wasn’t eaten by bugs and faded w/ age, would take a lifetime to master. The weapon has four problems, none of which can be solved here.
It needs a detonator; seems unlikely the device was installed without one, so someone removed it to prevent say accidental explosion.
It has unknown Launch Arming Codes, which need to be discovered.
It has a Fail-Safe Protocol, which is presently an enigma.
Lastly, it has a design flaw in the electronics, which need to be corrected w/ an R&R of fresh capacitors.
Currently the bomb is inert. Hit it all you want w/ a hammer—some have tried—it won’t go boom today. But watch out, the four problems may have a way of correcting themselves.