# Underground nuclear weapons (not for testing; as offensive weapons)

**URL:** <https://boards.straightdope.com/t/underground-nuclear-weapons-not-for-testing-as-offensive-weapons/978705>\
**Category:** Factual Questions\
**Created:** [January 24, 2023, 5:02am UTC](https://boards.straightdope.com/t/underground-nuclear-weapons-not-for-testing-as-offensive-weapons/978705 "2023-01-24T05:02:56Z")\
**Posts on this page:** 1\
**Showing post:** 14

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**Author:** ![Machine\_Elf](https://avatars.discourse-cdn.com/v4/letter/m/82dd89/32.png) [@Machine\_Elf](https://boards.straightdope.com/u/Machine_Elf)\
**Post date:** [January 25, 2023, 3:11pm UTC](https://boards.straightdope.com/t/underground-nuclear-weapons-not-for-testing-as-offensive-weapons/978705/14 "2023-01-25T15:11:39Z")

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> [@brossa](#):
>
> I would not have been keen on being the first to buy new postwar housing stock in Nagasaki.

Radiation levels in Hiroshima and Nagasaki dropped pretty quickly after the bombings.

> [@Post-bombing radiation levels in Hiroshima/Nagasaki?](https://boards.straightdope.com/t/post-bombing-radiation-levels-in-hiroshima-nagasaki/972820/6):
>
> This was helpful, thanks. It sounds like radiation levels faded relatively quickly after the bombing. From your link: These calculations showed that the highest dosage which would have been received from persistent radioactivity at Hiroshima was between 6 and 25 roentgens of gamma radiation; the highest in the Nagasaki Area was between 30 and 110 roentgens of gamma radiation. The latter figure does not refer to the city itself, but to a localized area in the Nishiyama District. In interpret…

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