And then there was one. How could the IDF destroy Iran's nuclear research bunker?

[Admiral Beez]

The GBU-28 is currently the winner on penetration, by something that doesn't require a B-2 to carry...100 feet of dirt and rock, or 20 feet of hardened concrete.

I would have thought that there would be an air dropped bunker buster that relied upon more than gravity for penetrative punch. How about a GBU-28 equipped with a rocket engine that accelerates it to high speed?

 

[SaparotRob]

Sounds like the "Disney" bomb.

 

[GreenKnight121]

The GBU-28 is currently the winner on penetration, by something that doesn't require a B-2 to carry...100 feet of dirt and rock, or 20 feet of hardened concrete.

However the GBU-28 is being replaced by the GBU-72... by the dates in this Wiki entry is a little dated (in the GBU-28 section):

In October 2021, the USAF completed assessments of the GBU-72 Advanced 5K Penetrator (A5K), a 5,000 lb (2,300 kg) penetrator bomb consisting of a BLU-138 penetrator warhead combined with a JDAM GPS guidance kit. In development since 2017, the GBU-72 is expected to cause significantly more damage against hardened, buried targets and is fitted with a more durable and efficient smart electronic fuse that can activate at a preprogrammed location. The Air Force plans to begin buying the weapon in 2022 to replace the GBU-28.[22]​ Israel is also reportedly interested.

In May 2024 it was reported that as part of joint American-British strikes on Houthi sites in Yemen the US Air Force used a GBU-72 to destroy an underground facility.
The US Air Force's B-1Bs and F-15Es are capable of deploying the GBU-72, along with the Israeli Air Force's F-15Is.

 

[cvairwerks]

However the GBU-28 is being replaced by the GBU-72... by the dates in this Wiki entry is a little dated (in the GBU-28 section):

Don't think the IDF has taken delivery of any GBU-72's as of yet. They requested to purchase some, but I haven't seen any mention of an FMS deal for them. Two news sources say they have them, but it hasn't truly been verified.

 

[Admiral Beez]

However the GBU-28 is being replaced by the GBU-72...

Well, we know of friends in Kyiv and Tel Aviv who would willingly take those close-dated munitions off America's hands. Disposal costs covered plus foes flattened.