A Russian cargo ship, the Ursa Major, sank in the Mediterranean Sea on December 23, 2024, after a series of explosions.. The vessel, initially reported to be carrying innocuous cargo, is now suspected of transporting nuclear reactors destined for North Korea, according to a CNN investigation.

Nuclear Cargo or Cover-Up?

The Ursa Major was officially listed as carrying manhole covers and cranes, but the ship's captain later admitted under pressure that the actual cargo included VM-4SG nuclear reactors, typically used in Russia’s Delta IV class ballistic missile submarines. This revelation has raised serious concerns about nuclear proliferation and covert military activities, according to the report.

The ship's journey took a dramatic turn when it suffered three catastrophic engine explosions near the Strait of Gibraltar, approximately 60 miles off the Spanish coast. Footage captured the vessel listing dangerously before it ultimately sank in international waters between Spain and Algeria.

International Response and Hazards

The sinking prompted a swift international response, with a Russian military vessel arriving to oversee rescue operations. A Spanish Navy patrol boat later joined the effort, and the area was declared hazardous to shipping. The presence of the Yantar, a Russian vessel with research capabilities, hovering over the wreckage for days added to the mystery, as reported by CNN .

Months after the incident, the U.S. military deployed a WC135-R 'nuclear sniffer' plane to the site in August 2025 and again in February 2026, highlighting the ongoing geopolitical ramifications of the event.

Unanswered Questions and Geopolitical Implications

The circumstances surrounding the sinking of the Ursa Major remain shrouded in mystery. Why did the ship sink after the initial explosions? What was the purpose of the additional explosions reported after the vessel went down? And what exactly was the Yantar doing over the wreckage for days? These questions remain unanswered , according to the report.

The incident has also raised concerns about the potential transfer of nuclear technology to North Korea, a country already under international sanctions for its nuclear program. the U.S. response, including the deployment of the nuclear sniffer plane, underscores the seriousness of the situation and the potential for further escalation.