I put this claim into Grok:
'Bunker busters like the GBU-57 MOP cannot easily penetrate 50 meters of earth followed by 10 meters of reinforced concrete. The earth layer alone pushes the limits of conventional bombs, and 10 meters of modern reinforced concrete (especially UHPC) is likely impenetrable by a single strike. Multiple precision strikes or nuclear options could theoretically succeed, but these come with significant logistical, technical, and ethical challenges. For such a heavily fortified target, adversaries would likely rely on alternative strategies, like dispersal or layered defenses, to mitigate the threat.'
Then I asked it can these bunker busters get at Iran's under the mountain nuclear facilities given their rumoured construction.
- Fordow: GBU-57 MOPs cannot reliably destroy Fordow’s deep underground chambers due to excessive rock depth (60–90 meters). Multiple strikes might disrupt operations but are unlikely to neutralize the facility.
- Natanz: Natanz is more vulnerable, and GBU-57s could potentially reach key areas with one or two strikes, assuming standard concrete and moderate overburden. Success depends on overcoming layered defenses.
- Feasibility: Any strike faces significant operational hurdles (air defenses, logistics, intelligence) and strategic risks (escalation, retaliation).