Russia's Poseidon Nuclear-Powered Torpedo: A New Era of Strategic Deterrence

On October 29, 2025, Russian President Vladimir Putin announced the successful test of the Poseidon 2M39, a nuclear-powered autonomous torpedo, often referred to as a "doomsday machine." This weapon is designed to unleash catastrophic destruction by creating radioactive tsunamis capable of devastating coastal cities. The test involved launching the Poseidon from a submarine and activating its nuclear power unit, marking a significant milestone in its development.

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The Poseidon is approximately 20 meters long and weighs around 100 tons, powered by a compact nuclear reactor that allows for virtually unlimited range and high speeds, reportedly up to 100 knots (115 mph). Analysts suggest it can operate at depths of around 1,000 meters, making it difficult to detect and intercept. The weapon is believed to carry a nuclear warhead with a yield estimated at two megatons, designed to cause extensive radioactive contamination upon detonation.

Poseidon Torpedo: A game-changer in nuclear deterrence

The Poseidon is part of Russia's broader strategy to enhance its nuclear deterrent capabilities, particularly in response to U.S. missile defense systems and NATO's expansion. By developing such advanced weapons, Russia aims to ensure a credible second-strike capability, reinforcing the concept of Mutually Assured Destruction (MAD). The weapon's ability to bypass traditional defenses positions it as a significant threat to coastal nations, potentially altering global military dynamics.

Poseidon Torpedo: A game-changer in nuclear deterrenceAfter the Burevestnik missile, Russia now tests the Poseidon 2M39 torpedo — what are its features and how deadly is it?iNewsBusiness Insider

Despite the Kremlin's claims, many experts express skepticism regarding the Poseidon's operational effectiveness. Critics argue that while the weapon's theoretical capabilities are alarming, its practical application remains uncertain. Some analysts suggest that the dramatic claims about its destructive potential may be exaggerated, viewing the announcement as a form of nuclear signaling rather than a genuine military advancement.

After the Burevestnik missile, Russia now tests the Poseidon 2M39 torpedo — what are its features and how deadly is it?

Dr. Pavel Podvig, a senior researcher in nuclear weapons, cautioned that while the Poseidon could theoretically create large ocean swells, the actual impact may not be as catastrophic as suggested. He emphasized that the weapon's primary threat lies in its nuclear fireball rather than the tsunami effect.

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Putin characterized the Poseidon as unmatched in speed and power, asserting that it surpasses even Russia's most advanced intercontinental ballistic missiles. He framed the test as a necessary response to perceived threats from the West, particularly following the U.S. withdrawal from the Anti-Ballistic Missile Treaty. In contrast, U.S. President Donald Trump criticized the test as "not appropriate," urging Putin to focus on resolving ongoing conflicts, particularly in Ukraine.

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The Poseidon represents a significant evolution in nuclear deterrence, combining autonomy, deep-water operation, and nuclear power. While its full operational capacity remains unclear, the weapon's introduction adds a new layer of complexity to global security considerations. As nations reassess their defense strategies in light of this development, the Poseidon underscores the importance of monitoring undersea nuclear capabilities and the potential humanitarian and environmental risks associated with its use.

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