Iran also already have a conventional (or not) second strike capability https://patarames.blogspot.com/2020/11/irans-path-to-second-strike-capability.html?m=1
Technically US most powerful bunker buster bombs (GBU-57) cannot reach at all underground launching sites, they aren't just built underground, but under mountains, meaning the ordnance would have to pierce through 500m of granite and concrete reinforcements at the end, neither nuclear bunker buster bombs would have that capability, the only thing would be to strike the entrance and exits, but new entrances can be made with excavators/other machines inside. This would be literally an exploding volcano.
No matter if Iran is struck with nuclear weapons, there will be a response.
The only missing thing are nuclear weapons, even the current stockpile of conventional missiles are enough to cause massive damage to any neighboring country, for having a full deterrence capability, Iran should have the capability to strike inside US homeland, with nuclear weapons, you just cannot rely on conventional missiles for such a big country and Europe, conventional weapons are fine for neighboring countries/the region.
Iran would also little by little move on hypersonic glide vehicles, because currently any ballistic missile launched by Iran are detected immediately by western satellites thus giving them a little time and using anti ballistic systems at the best moment to intercept them (when they are at a stable speed and trajectory), even if a lot would reach their targets, some would be intercepted and allow them to respond quicker before the missiles reaches their targets, the west overrely on satellites, Iran should get the capability to eliminate them.
For country such as the US, target New York, DC, Los Angeles, San Francisco and social media infrastructures (wipe out silicon valley), Seattle, Dallas, Las Vegas, Philadephia
Also pursuing nuclear device researches to obtain thermoclear and neutron weapons, this would allow to completely eliminate a state that would use nuclear weapons on Iran, Iran should also keep ambiguity about its program and kick out IAEA personel.
Technically US most powerful bunker buster bombs (GBU-57) cannot reach at all underground launching sites, they aren't just built underground, but under mountains, meaning the ordnance would have to pierce through 500m of granite and concrete reinforcements at the end, neither nuclear bunker buster bombs would have that capability, the only thing would be to strike the entrance and exits, but new entrances can be made with excavators/other machines inside. This would be literally an exploding volcano.
No matter if Iran is struck with nuclear weapons, there will be a response.
The only missing thing are nuclear weapons, even the current stockpile of conventional missiles are enough to cause massive damage to any neighboring country, for having a full deterrence capability, Iran should have the capability to strike inside US homeland, with nuclear weapons, you just cannot rely on conventional missiles for such a big country and Europe, conventional weapons are fine for neighboring countries/the region.
Iran would also little by little move on hypersonic glide vehicles, because currently any ballistic missile launched by Iran are detected immediately by western satellites thus giving them a little time and using anti ballistic systems at the best moment to intercept them (when they are at a stable speed and trajectory), even if a lot would reach their targets, some would be intercepted and allow them to respond quicker before the missiles reaches their targets, the west overrely on satellites, Iran should get the capability to eliminate them.
For country such as the US, target New York, DC, Los Angeles, San Francisco and social media infrastructures (wipe out silicon valley), Seattle, Dallas, Las Vegas, Philadephia
Also pursuing nuclear device researches to obtain thermoclear and neutron weapons, this would allow to completely eliminate a state that would use nuclear weapons on Iran, Iran should also keep ambiguity about its program and kick out IAEA personel.