Posidon is a Russian underwater unmanned vehicle with a nuclear power plant, officially positioned as a strategic retaliatory strike weapon. Its main feature is the ability to carry a nuclear warhead over virtually unlimited distances underwater, making it a fundamentally new class of weaponry without equivalents in the world.

Key Characteristics

According to official statements and expert assessments, the parameters of the vehicle are as follows.

Development History

The existence of the vehicle was first known in 2015 through a leak on Russian state television. Officially, \"Posidon\" was presented by President Vladimir Putin in 2018 as part of the announcement of new strategic weapons.

The key phase of testing was in October 2025, when, according to Putin, it was first possible not only to launch the vehicle from a submarine carrier but also to activate the nuclear power plant, which operated for a certain period of time. In May 2026, Putin stated that work on \"Posidon\" was at the final stage.

Role and Purpose in Strategy

\"Posidon\" is considered as a retaliatory strike weapon. Its task is to guarantee the destruction of critically important coastal facilities of the enemy (military bases, ports, cities) even if anti-ballistic missile defense (ABM) systems intercept ballistic missiles.

The key advantage over traditional carriers is the ability to bypass existing ABM systems. Missiles can be intercepted on their trajectory, but \"Posidon\" moves underwater, where modern countermeasures are ineffective. Moreover, the nuclear power plant gives it virtually unlimited range, allowing attacks on targets along the coast of any country.

Assessments and Skepticism