Poseidon

Russia’s nuclear-powered, nuclear-armed autonomous intercontinental torpedo — a second-strike weapon designed to approach coastal targets deep beneath missile defenses, now slowly materializing after a decade of staged leaks, test-launch claims and visible carrier-submarine construction.

Overview

Poseidon (2M39, NATO reporting name “Kanyon”) is a strategic, nuclear-powered, nuclear-armed unmanned underwater vehicle originally known under the Russian codename “Status-6.” Developed by the Rubin Central Design Bureau, it is best understood as an intercontinental torpedo: a one-way autonomous vehicle that cruises for days or weeks at depth to deliver a multi-megaton warhead against ports, naval bases and coastal cities. The entire concept is built around exploiting a gap in missile-defense architecture — an incoming warhead approaching underwater is not intercepted by the ballistic-missile-defense systems that Russia’s leadership has spent two decades railing against. No operator has yet fielded the weapon, and performance rests almost entirely on Russian state assertions, but the physical infrastructure to support it is real and growing: the giant special-purpose submarines Belgorod (delivered 2022) and Khabarovsk (launched 2025) carry six tubes each, and a multi-vehicle force is planned.

Development

The program entered public consciousness on 10 November 2015, when a Russian state-television camera crew appeared to “accidentally” film a briefing slide on the oceanic multipurpose system Status-6 — an exposure the CIA assessed as intentional. Vladimir Putin formally unveiled Poseidon on 1 March 2018 as one of six new strategic “super weapons” justified by the U.S. withdrawal from the Anti-Ballistic Missile Treaty. The visible hardware trail, however, stretches back much further. Covert Shores’ OSINT timeline documents the rebuilt test sub B-90 Sarov (bow lengthened 2008–09), dummy test rounds and lifting frames at Severodvinsk from 2010, and purpose-built support ships Zvezdochka and Akademik Aleksandrov.Covert Shores Poseidon The first confirmed test launch occurred on 27 November 2016 from Sarov in the Arctic, according to a Pentagon account cited by Wikipedia. Carrier construction followed: Belgorod (Project 09852, a stretched Oscar-II, ~184 m, six tubes) was delivered in July 2022, and Khabarovsk (Project 09851, ~135–136 m, Borei-A-derived stern and pump-jet, six bow tubes) was laid down in July 2014 and launched on 1 November 2025.Naval News

Design & capabilities

Poseidon is an enormous vehicle by torpedo standards — estimated at 20–24 m long, 1.6–2 m in diameter and roughly 100–110 tonnes. A miniature nuclear reactor (type not publicly established; liquid-metal-cooled and gas-cooled designs have been suggested) drives a pump-jet, offering effectively unlimited endurance on paper while feeding steam to a turbine. Independent range estimates cluster around 10,000 km (over 5,000 nmi), though Russian state-media have repeatedly claimed unlimited reach.USNI Proceedings Speed is one of the most contested parameters: Russian-connected sources have floated figures up to 100 knots or even 200 km/h, but the Pentagon’s estimate is about 56 knots, and Covert Shores’ detailed analysis, which found no evidence of supercavitation, places the credible sprint speed at roughly 70 knots.Covert Shores Poseidon The vehicle is believed to operate at depths of about 1,000 m, placing it beyond the engagement envelope of most lightweight anti-submarine torpedoes.

The warhead is the weapon: a nuclear device most often assessed at ~2 megatons, with some reports citing yields as high as 10 MT (and occasional outlier claims to 100 MT).USNI Proceedings Guidance is fully autonomous after launch; Russian-derived reporting mentions GLONASS-aided navigation and even “AI” steering, but no verified description of the sensor or control suite exists.

Variants

The baseline vehicle is submarine-launched from the large-diameter tubes aboard Belgorod, Khabarovsk and planned follow-on hulls. A reported “Skif” seabed-launched variant would sit in a container on the ocean floor awaiting an activation signal — a concept that has appeared in Russian patent filings and that would, if nuclear-armed and placed beyond 12 nautical miles, contravene the 1972 Seabed Arms Control Treaty. Unverified Russian commentary has also floated a vehicle family notionally optimized either for coastal attack or for an anti-carrier role, though Western analysts treat the latter mission with considerable skepticism.Wikipedia

Combat record / operational use

Poseidon has never been used in combat. The test program remains the sole measure of progress:

• 27 November 2016 — first test launch from B-90 Sarov in the Arctic, acknowledged by the Pentagon.Wikipedia
• 20 February 2019 — Russian Ministry of Defence released video of a Sarov launch, with Putin declaring key trials complete.
• Summer 2021 — satellite imagery spotted a Poseidon-sized test round aboard the support ship Akademik Aleksandrov.
• January 2023 — TASS reported “throw tests” (ejection without reactor activation) from Belgorod and claimed the first production batch had been manufactured, though no independent confirmation followed.
• 28 October 2025 — Putin announced the weapon had been launched from a carrier submarine for the first time and had run under its own nuclear power unit “for a certain amount of time.” OSINT researcher Thord Are Iversen tracked six unidentified ships off Novaya Zemlya that day, with the Kara Sea assessed as the probable test area.The War Zone The Barents Observer The claim, coming two days after a Russian Burevestnik cruise-missile test claim and during the annual Grom strategic exercise, was widely interpreted as deliberate nuclear signaling toward Washington.Arms Control Association
• 12 May 2026 — Putin said Poseidon was in the “final stages” of development; the Institute for the Study of War assessed the announcement as part of a broader nuclear saber-rattling campaign.Al Jazeera ISW

Advantages

• Missile-defense bypass: approaches entirely underwater, rendering existing ballistic-missile-defense radars and interceptors irrelevant — the entire strategic rationale for the system post-ABM-Treaty withdrawal.Covert Shores Poseidon
• Covert transit: nuclear propulsion allows weeks-long, low-speed “silent-running” with claimed detection radii of only a few kilometers at low speed, though these are Russian designer figures.Covert Shores Poseidon
• Depth and speed combination: reported ~1,000 m operating depth and high sprint speed outmatch standard lightweight Western ASW torpedoes, complicating intercept.USNI Proceedings
• Visible delivery infrastructure: Belgorod is already in service and Khabarovsk is in the water, indicating sustained programmatic commitment regardless of the weapon’s exact maturity.Naval News

Drawbacks / limitations

• Slow by strategic standards: hours-to-days-long transit versus ~30 minutes for an ICBM forfeits decision time and creates extended tracking opportunities; the same critique that applies to nuclear-powered cruise weapons applies here.The War Zone
• “Radioactive tsunami” myth debunked: an underwater nuclear burst radiates energy in 360°, attenuating far faster than a directed natural tsunami; James Mattis stated the weapon “does not change at all the strategic balance.”Wikipedia
• Contested specifications: claimed speeds and yields range over orders of magnitude, from 56–200 km/h and 2–100 MT, making independent verification impossible — classic Russian claim-based marketing.Covert Shores Poseidon
• Submarine paradox: building dedicated multi-billion-ruble carrier submarines implicitly undercuts the unlimited-range narrative; Defense Express reads it as Moscow itself hedging on range, propulsion reliability and autonomous guidance.Defense Express
• Chronic delays: Khabarovsk took over a decade from keel-laying to launch, and the weapon first trailed in 2015 was still in “final stages” in May 2026 — a timeline shaped by COVID, design changes, and resource competition from the war.Covert Shores Khabarovsk Al Jazeera

Counterparts

• Anduril Ghost Shark (USA/Australia)
• Sea Baby (Ukraine)

Outlook

Poseidon is visibly transitioning from a propaganda instrument into a tangible, if still nascent, force element. A claimed powered test run, the arrival of a purpose-built serial carrier, and Putin’s “final stages” framing give the program a forward momentum that the West can no longer dismiss as pure bluff. USNI expects Khabarovsk could enter service by the end of 2026, with Ulyanovsk and possibly Orenburg to follow. Still, every critical parameter — range, speed, depth, yield and guidance reliability — rests on Russian assertions, and analysts from USNI to Defense Express expect years more trials before a credible operational capability emerges. The West is already treating the threat as a driver for renewed anti-submarine warfare and seabed-sensor investment, regardless of the weapon’s current maturity.

Key specifications

Sources

1. Wikipedia — Poseidon (unmanned underwater vehicle). https://en.wikipedia.org/wiki/Poseidon_%28unmanned_underwater_vehicle%29
2. The War Zone (TWZ) — Powered Test Of Poseidon Nuclear Torpedo, Putin Claims. https://www.twz.com/sea/powered-test-of-poseidon-nuclear-torpedo-putin-claims
3. Covert Shores (H I Sutton) — Russia Finally Launches The Poseidon Armed Submarine Khabarovsk. https://www.hisutton.com/Russian-Submarine-Khabarovsk-20251102.html
4. Covert Shores (H I Sutton) — Poseidon Intercontinental Nuclear-Powered Nuclear-Armed Autonomous Torpedo. https://www.hisutton.com/Poseidon_Torpedo.html
5. USNI Proceedings — Russia’s Khabarovsk Submarine and Poseidon Torpedo: Changing the Nuclear Dynamic. https://www.usni.org/magazines/proceedings/2026/january/russias-khabarovsk-submarine-and-poseidon-torpedo-changing
6. Naval News — Russian Navy’s Kharabovsk Special Purpose Submarine Hits the Water. https://www.navalnews.com/naval-news/2025/12/russian-navys-kharabovsk-special-purpose-submarine-hits-the-water/
7. Defense Express — If Poseidon Nuclear Mega-Torpedo Has Unlimited Range, Why Is Russia Building a Second Giant Submarine for It? https://en.defence-ua.com/analysis/if_poseidon_nuclear_mega_torpedo_has_unlimited_range_why_is_russia_building_a_second_giant_submarine_for_it-18459.html
8. The Barents Observer — Here comes Russia’s first serial submarine to carry nuclear-powered giga-torpedoes. https://www.thebarentsobserver.com/security/here-comes-russias-first-serial-submarine-to-carry-nuclearpowered-gigatorpedoes/439639
9. RFE/RL — Putin Says Russia Tests New, Nuclear-Capable Remote Torpedo Dubbed ‘Doomsday Machine.’ https://www.rferl.org/a/russia-putin-torpedo-poseidon-burevestnik-missile-nuclear/33575625.html
10. Arms Control Association — Russia Tests Nuclear-Powered Cruise Missile, Torpedo. https://www.armscontrol.org/act/2025-11/news-briefs/russia-tests-nuclear-powered-cruise-missile-torpedo
11. Al Jazeera — Putin hails Russia’s test launch of ‘most powerful missile in the world.’ https://www.aljazeera.com/news/2026/5/13/putin-hails-russias-test-launch-of-most-powerful-missile-in-the-world
12. Institute for the Study of War — Russian Offensive Campaign Assessment, May 12, 2026. https://understandingwar.org/research/russia-ukraine/russian-offensive-campaign-assessment-may-12-2026/