CNN:
"The US military dropped 5,000-pound guided bombs designed to penetrate targets deep underground on Iranian missile sites along the Strait of Hormuz on Tuesday, US Central Command announced on X.
“Hours ago, US forces successfully employed multiple 5,000-pound deep penetrator munitions on hardened Iranian missile sites along Iran’s coastline near the Strait of Hormuz,” CENTCOM said. “The Iranian anti-ship cruise missiles in these sites posed a risk to international shipping in the strait.”"
So the US are doing the no brick left standing method. Starting with the coast, and presumably working inland to a distance equal to the range of the missiles. And that's quite far.
Instead of doing the standard Vietnam comparison, we could do the Battle of Monte Cassino instead.
That's the one where the Germans held a hilltop Monastery and promised not to fight from it. But instead of going around, the allies flattened it with Bombers, and the Germans moved into the rubble and did start fighting, the rubble atop a hill making a perfect defensive position. Combined deaths of about 180 k resulted.
So yeah, I think with man portable drones being used against unarmoured slow moving massive ships full of stuff that burns, landscaping the coastline to new rubble and bomb holes might not work.