Can anybody estimate what the blast radius of that thing would be if it was detonated? I'm not THAT close, but it'd still be nice to know.
Since it is buried under quite a bit of water and silt that would act as an energy sink, I would guess that a 5 mile radius is probably the "safe" distance for primary blast effects even if it got full yield when it went off. As old as it is, you'll get much less than designed yield though (if any at all).