> The Russian warship Ivan Gren soon arrived, demanded control of the site, and launched flares—likely to disrupt satellite surveillance. Shortly after, the Ursa Major disappeared from the surface. Seismographs recorded underwater explosions, and the ship sank to a depth of 2,500 meters.

whoa so what/who struck it?

Anyway it is too often south of Spain which is getting these freak nuclear catastrophes https://en.wikipedia.org/wiki/1966_Palomares_accident