I know what you mean, I feel the same exact way!
I'm sure you know this already; the Yugoslavian Serbs originally came up with Željava underground MiG-21 shelter base which wasn't really underground, more like inside a mountain on what's today the Bosnian/Croatian border.
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The Serbian forces ended up destroying it while retreating at the end of '94 after NATO bombed the living daylights out of Yugoslavia. Brilliant idea but I would think potentially difficult logistically and probably costly, too.
For Iran it's probably a great thing because it'll save the fighters and if the runways get hit, at least those can be quickly repaired and put back into action whereas the fighters are a different story. And that one for the F-4 Phantoms looks like it's huge with many converging tunnels. And difficult to find.