a CNN investigation into the Russian cargo ship Ursa Major, which sank in December 2024 off Spain's coast after a series of explosions while carrying components for two submarine nuclear reactors. Investigators determined the cargo was likely destined for North Korea, part of a covert transfer linked to Pyongyang's military aid to Russia in Ukraine, with the ship operating in Russia's shadow fleet under false manifests. The deep-water sinking at around 2,500 meters, preceded by seismic signals and followed by US nuclear-detection flights and Russian vessels in the area, points to possible Western intervention to block proliferation.