Somewhere inside the sprawling Sevmash shipyard in Severodvinsk, on Russia’s White Sea coast, a submarine unlike any other is believed to be nearing completion. The Khabarovsk is not designed to hunt enemy warships or launch ballistic missiles from hidden ocean trenches. According to leaked Russian military documents and subsequent official statements, its sole purpose is to carry the Poseidon, an autonomous, nuclear-powered torpedo built to cross entire oceans at depth and detonate a nuclear warhead near an adversary’s coastline, contaminating vast stretches of shoreline with radiation.
Multiple Russian defense-industry sources cited by TASS in late 2024 indicated that the Khabarovsk could begin initial sea trials in 2025. That timeline slipped without public explanation, and as of mid-2026, no official Sevmash or Russian Navy statement has confirmed a new date. Western analysts monitoring commercial satellite imagery of the Severodvinsk yard say construction activity around the Khabarovsk’s covered building hall has continued, but the submarine has not been photographed in open water.
The evidence trail starts with a TV broadcast
Public awareness of the program traces back to November 2015, when Russian television networks NTV and Channel One aired footage of a meeting with President Vladimir Putin. Over the shoulder of a military official, cameras captured a classified planning document labeled “Status-6.” The diagrams depicted a large unmanned underwater vehicle designed to carry a thermonuclear warhead across intercontinental distances, traveling deep enough to evade existing anti-submarine defenses. Its stated mission, visible in the document’s text, was to create “zones of extensive radioactive contamination” along an enemy coast, rendering port cities and naval bases unusable. The Kremlin later acknowledged the document was real but said its appearance on television was accidental.
Three years later, the program moved from leak to official showcase. During his March 2018 address to the Federal Assembly, Putin played an animated video depicting a large underwater drone navigating past NATO defenses and detonating near a coastline. He announced the weapon’s new name: Poseidon. The address also revealed five other advanced strategic systems, framing them collectively as Russia’s answer to U.S. missile-defense expansion. That speech remains the highest-level official confirmation that the Poseidon program is funded, active, and considered a pillar of Russian nuclear strategy.
Two submarines, one weapon
Russia has linked two submarine platforms to the Poseidon system. The first, the Belgorod, is a heavily modified Oscar II-class boat commissioned into the Russian Navy in July 2022, according to a TASS report at the time. Russian officials have described the Belgorod as a “special-purpose” submarine, and Western intelligence assessments reported by the Congressional Research Service have identified it as a likely test platform for Poseidon prototypes. The Belgorod’s oversized hull provides space for the torpedo, which at roughly 24 meters long and two meters in diameter dwarfs any conventional weapon in any navy’s inventory.
The Khabarovsk is the second platform and is believed to be purpose-built from the keel up to carry multiple Poseidon torpedoes operationally, rather than serving as a test bed. Open-source analysts, including researchers at the Center for Strategic and International Studies, have assessed that the Khabarovsk’s hull was laid down at Sevmash around 2014, though exact dates remain unconfirmed. If the submarine enters sea trials in the coming months, it would mark the transition of Poseidon from an experimental concept tested aboard a converted boat to a dedicated weapons system approaching operational status.
What remains genuinely unknown
Despite the 2015 leak and the 2018 presidential address, critical questions about the Poseidon’s actual capabilities remain unanswered.
No confirmed, independently documented test of the Poseidon torpedo’s nuclear propulsion system has been reported. Claims about its speed (sometimes cited as over 100 knots), maximum operating depth (over 1,000 meters), and warhead yield (estimates range up to multiple megatons) originate from the leaked Status-6 document and Russian state media. None have been verified by outside observers or acknowledged in detail by the Russian Ministry of Defense.
The question of whether the 2015 broadcast was genuinely accidental also remains open. The Kremlin called it a mistake. Some Western analysts, including former U.S. defense officials who commented publicly at the time, argued it was deliberate strategic signaling: a way to alert Washington to a new class of weapon without the diplomatic overhead of a formal declaration. The document was visible on screen for several seconds while cameras were clearly rolling. Whether that reflects carelessness or calculation is a judgment call, not a settled fact.
There is also uncertainty about how the weapon fits into Russia’s broader nuclear posture. Poseidon does not fall neatly into the categories covered by existing arms-control frameworks. The New START treaty, which capped deployed strategic warheads and delivery vehicles, expired in February 2026 without a successor agreement. Even when it was in force, New START did not cover autonomous underwater nuclear delivery systems. That means Poseidon exists in a regulatory vacuum: no treaty limits its production, no inspection regime monitors its deployment, and no bilateral channel currently exists to discuss its role in strategic stability.
Why the ambiguity itself matters
For U.S. and NATO defense planners, the challenge posed by Poseidon is not only technical but informational. The 2022 U.S. Nuclear Posture Review referenced Russia’s development of “novel nuclear delivery systems” without naming Poseidon directly, signaling that the Pentagon takes the program seriously even without full visibility into its progress. The U.S. Navy has not publicly disclosed any specific countermeasure program tailored to intercept a deep-running, nuclear-powered autonomous torpedo, though analysts at the Rand Corporation and elsewhere have noted that existing undersea sensor networks were not designed with such a threat in mind.
At the same time, technically ambitious weapons programs frequently encounter delays, redesigns, or quiet cancellations. Russia’s defense industry has a documented history of announcing advanced systems years before they reach operational status, and in some cases, programs have stalled indefinitely. Without confirmed sea trials, independently observed test launches, or an official Russian Navy declaration that Khabarovsk-class submarines are operational, it is impossible to say with confidence whether Poseidon currently represents a near-term deployed capability, a prototype still working through engineering problems, or primarily a tool of psychological leverage.
What can be said with confidence is narrower than most coverage suggests. Russian planners conceived and funded an autonomous nuclear torpedo aimed at coastal targets. Putin personally showcased it as a strategic priority. At least one submarine, the Belgorod, has been commissioned with a reported connection to the program. A second, the Khabarovsk, appears to be under construction at Sevmash. Beyond those anchored facts, the story of Russia’s doomsday torpedo still rests heavily on a few seconds of television footage from a decade ago, a presidential animation, and a long trail of inference that has yet to be confirmed or refuted by hard evidence.
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*This article was researched with the help of AI, with human editors creating the final content.
