Yeah what I meant. A lot of good scientific videos of the damage it would do (Kurzgesagt especially if anyone wants to watch), but not really something that gets tested that way *for some reason* lolDon't get me wrong, nukes can wreak damage like no other, but I think thanks to movies people vastly over estimate the immediate damage. Even Tsar Bomba (the 50Mt weapon the Soviets tested) would flatten a city, and the pressure wave would travel for several miles killing a lot of people, they won't gouge out huge holes in the planet.
A shockwave from a land based weapon wouldn't create any meaningful sub-surface wave. And even if it did, it wouldn't effect a sub in the slightest. The nuke would have to detonate underwater, i would probably say less than 10 miles from the sub for it to be a danger.....(though that is purely speculation, AFAIK it isn't something that has been tested (or at least release publicly))
As I said, hopefully we don't see what happens.
