Ukrainian Poseidon Operation Exposes Russian Navy Technical Documents

A Ukrainian hacker group said its Poseidon operation obtained technical documents covering about 70 Russian Navy programs, including submarines, surface ships, navigation, sonar, and marine robots. InformNapalm authenticated some samples; the full leak size is not independently verified.

According to Indian outlet Defence News on 22 September, a Ukrainian hacker group said it ran a cyber operation codenamed Poseidon and obtained a large set of Russian Navy technical documents. The group published the claim on 20 September, along with document screenshots and samples.

Scope of the files

The material covers about 70 Russian Navy programs. It includes submarines, surface ships, navigation systems, sonar, and marine robotic equipment. Some files are marked secret or top secret. The newest documents are dated 2026.

Named programs and bureaus

Named platforms include Project 949AM Antey-class nuclear submarines, Project 636.3 Varshavyanka-class diesel-electric submarines, Project 955M Borei-A ballistic-missile nuclear submarines, and several surface-ship types. Files include equipment layouts, cable and interface diagrams, technical specifications, and acceptance documents. Much of the content focuses on inertial navigation, hydroacoustics, and underwater unmanned systems.

Organizations named in the files include the Rubin Design Bureau and the Malachite Marine Engineering Bureau.

Independent checks

Open-source intelligence group InformNapalm checked some samples and said they were authentic. The full scale of the leak has not been independently verified.

Disclaimer: this item is compiled from overseas sources. Technical details and figures are for reference and do not represent the views of this publication. Readers should verify before use.