Remember there is approximately 2 grams of condensation per diem damaging some of the tomb work by drawing out the salts from the stone they are aware of today (Tutankhamen's tomb being an example.)

Wouldn't it be wise to assume when sealed in it's original unventilated state what you describe is 5,000 years of accumulated dews rather than several sizable geysers? It is at least a possible explanation?

I believe all the work crews needed constant water to avoid dehydration and death. Aren't there multiple paintings showing water carriers supplying this need? If there was a nearby source of dependable water, why have carriers?

I am not saying your theory is impossible, merely pointing out there are some serious challenges to filling in details.

Jammer