#3 I can see a fireball coming down that tunnel.
Look like Shahab-3 medium range missiles to me, which have the range to hit Israel. Video is well-produced and edited; you’ll note all the missile transporter, erector and launch (TELAR) vehicles are lined up on one side of the tunnel to create a more impressive delay. My guess is that some of the missiles and TELARs are decoys.
Tehran has been working on underground missile bases for more than a decade—however, none are 1500 feet below the earth. Many were built by tunneling into the side of a mountain, and we’ve done a fairly decent job in pinpointing the real entrances and ventilation shafts, which are excellent aim points for precision-guided conventional weapons, fuel air explosives or even a tactical nuke.
One problem with underground basing is that a preemptive strike can trap many of your missiles underground, and it takes a while to dig them out. The Iranians tried to solve that issue at one base near the Persian Gulf by drilling a large “launch portal” in the middle of the underground complex, allowing a TELAR to elevate its missile and fire without leaving the subterranean base. However, creating a hole large enough to launch a missile also creates a nice pathway for enemy missiles, bombs and other munitions.
Back in the early part of the last decade, Iran bought a large number of super-jumbo drills and tunneling machines, ostensibly to dig the Tehran subway. Everyone knew that was a ruse, and we subsequently saw a lot of those machines well outside the city. Now, a decade later, you can see what that tunneling equipment (built mostly in Europe) was used for.