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the bunker buster, if used, will almost certainly be nuclear. estimated tonnage: 300 kt


MOP is a conventional weapon, 30,000 lbs. Only the B-2 is rated to carry it.

https://en.wikipedia.org/wiki/GBU-57A/B_MOP


Genuinely surprised that Israel couldn't push one out of their c-130s


The kinetics matter here. The B2 flies much higher than the C-130 which would aid the GBU-57 MOP (almost certainly used here) in it's ability to penetrate to maximum depth. 80% of the 15 ton weight of that bomb is just heavy metal to give it maximum energy as it borrows into the ground.

Also, each B2 can carry 2 MOPs making it a better platform than a C-130, and that isn't even taking the stealth of the platform into account


> Also, each B2 can carry 2 MOPs

Wow. That is amazing. 60,000 lbs. combined.


Don't think the C-130s can fly high enough with a single 30,000lb bomb. The graphic at bbc site show it would be dropped from about 12km (~40,000 ft) in order to gain the speed needed to drive it some 60m underground.


From 40,000 feet, the bomb would take ~ 50 seconds to fall and would impact at mach 1.5.


Various sources are saying 6 to 12 of these bombs were used. So, you'd need a lot of C-130s and those planes are too slow to NOT get shot down.


Do they even have access to this variant? I thought they had access to the older ones that weren't as advanced.


The MOP isn't particularly 'advanced', it's basically refined version of the Korean-vintage Tarzon guided earthquake bombs. It's just too heavy for most military aircraft to carry.

The IDF has the F-15I which has a centerline hard point rated for 5,000lb load. That's immense for a fighter but a magnitude too low for the MOP.

There are a variety of smaller US penetrating bombs that the F-15 can handle, but they don't have the mass and structure to penetrate as deeply.


They do not.


Israel hasn’t degraded Iranian air defenses that much. The stuff that can’t threaten a F-35 can still trouble a C-130.


According to Israel they fly freely in West/central Iran and use all the plains including F15/16. Initially they relied on the F-35's stealth but as of last week they claim air superiority.


Why do you say this? Israel only lost 1 drone.


The US has B52s that are cheaper, but they used B2s for this operation. It seems they don't believe Iran's air defenses to be toothless.


You are correct but although the B52 can technically carry the GBU-57 MOP, but it was only done that way during the initial testing of the weapon. The B2 is the only aircraft the USAF actually uses for that munition in combat scenarios.

Also the B2 is better suited for extreme endurance missions like this where the plane is in flight for >36 hours. It has a toilet, microwave and a cot for the pilots to use during the more mundane parts of the mission.


C-130s are very large, slow targets.


video shows how confused and disoriented are whatever SAM that survived

https://www.reddit.com/r/CombatFootage/comments/1lb8mkc/iran...


Those are likely being jammed.

You can threaten a C-130 with visually guided WWII era flak.

You are unlikely to get an F-35 with it.


yeap. but at this point of time F15/16 and drones are flying freely. so far losses are 3 drones. C-130 could probably find his way to fordow


Israel doesn't have access to the MOP.


The GBU-57 was most likely used, which is non nuclear


> almost certainly be nuclear

Source:


This is nonsense.


those of you hating on this comment, the conventional weapons could not possibly work, the facility is too deep


Even after everyone corrected you with information on the specific ordinance used, you're doubling down?


they might be right, but that's why the attack failed and why there's a risk what I said might still come true

i was listening to Al Jazeera, one of the DC flaks they interviewed gave an upper estimate of the facility depth as 1000 ft. The conventional device can go to something like 60m or 200 ft. 6 devices were dropped, they would have to have everything, including geology with repeated strikes on the same point, be perfect to get past 1000 feet, and then they probably would not destroy the whole facility. As far as I know, they don't even have a good map of the layout.

hence, the only real option is a nuclear weapon. this is absolutely being considered inside the pentagon. our government is psychotic. a 1 kt nuclear weapon (laughably small, hiroshima was 15 kt) is 73x more powerful than a 30,000 lb bomb. they would be like, well, it's an underground explosion! The world will forgive us. it's so crafty and smart to use a nuke to stop a nuke (that doesn't exist).

https://x.com/ArmsControlWonk/status/1935741526191100181

"The effectiveness of GBU-57s has been a topic of deep contention at the Pentagon since the start of Trump’s term, according to two defense officials who were briefed that perhaps only a tactical nuclear weapon could be capable of destroying Fordow because of how deeply it is located."

https://www.theguardian.com/world/2025/jun/19/trump-caution-...


Ok, I see the logic, but nuclear weapon use is the brightest red line in the world. If there's anything a government wouldn't be forgiven for, it's that. I can't imagine how the calculus for the US would work out in favor given the risk. (Of course that assumes rationality, which one could certainly argue is lacking, but even still.)

Also 1000ft is an upper estimate, right? It's certainly possible the MOPs were sufficient.


It’s possible the MOP was sufficient but I suspect not. Probably parts of the facility are shallower and others are deeper, such is the topology of a mountain.

If you ever engage with what Daniel Ellsberg said, or US plans in north korea or vietnam, you’d know just how close the US comes to actual use in war. It’s never off the table. They are currently concerned with peer competition with China. There is likely a faction that would propose to attempt to show american strength on an unarmed target just like we did with Japan.

However at this juncture i’m starting to think this is all a show and they only care about the optics. Iran has already moved its equipment out of Fordow. However if the Iran war continues, expect things to get increasingly ugly.


the US has already been forgiven for nuclear weapon use, twice. this would suggest that the US would be forgiven a third time


Very different situation; the norm against use hadn't been established at that point, and it was in the midst of a world war.




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