If I didn't have any way to attack Iran's deep bunker from the air, how would I attack it from the ground?
It might seem all James Bond like to go deep into the ground and plant a few charges, but that's not going to solve our problems. Plus, getting down there and back out against even light opposition would be near impossible.
A better idea would be to use the Bunkers own systems against it. Elevator shafts are needed to bring equipment and personnel in and out, and ventilation shafts are needed to provide fresh air and exhaust stale air. I would expect there to be a minimum of 4 intake and 4 exhaust shafts, and any entrances to these shafts to be guarded and somewhat armored, but explosive breaching could provide access.
What could hide in plain sight, and be rapidly brought close to a target? A typical fuel tanker truck we see on the highway every day. Several of these within a few miles of the target would probably not raise any suspicion.
A typical fuel tanker truck has a capacity of 7500 gallons of diesel or gasoline. Mixed with certain fertilizer chemicals you get a slurry that could be dropped down every elevator and ventilation shaft. There are usually 4 separate fuel compartments on each trailer with its own separate drop hose capable of dropping the entire load in 7.5 to 8 minutes. Multiple trucks around each ventilation shaft could reduce time on target to less than 15 minutes total.
Tamping would not be an issue as there is over 1/4 of a mile of Terra Firma already over the charge/target area. Multiple time delay systems would be favored for lighting things off.
At slightly more than 6.5 pounds per gallon, 7500 gallons per truck, 10 such fuel trucks would give us a total charge weight of 487,500 pounds.
I think that would be a tough gig to pull off, but would be 100% decisive if successful. Ukraine just pulled off a mission deep into Russia with large tractor trailer trucks, so such things are possible.
...and now back to our regularly scheduled programming of relaxing Polka music by Frank Novak and the Cleveland Polka All Stars.