A Mysterious Russian Submarine Has Been Spotted in the Middle of the Atlantic Ocean A recent sighting of a Russian Navy submarine in the middle of the Atlantic Ocean has sparked concerns about the intentions of Moscow's military. The submarine, identified as a diesel-electric attack submarine, was spotted by a US Navy P-8 Poseidon aircraft on Tuesday. The incident has raised questions about whether Russia is expanding its naval presence in the region, and whether it poses a threat to Western interests. As tensions between Russia and the West continue to escalate, the sighting of this submarine is likely to add to the growing unease about Russia's military activities.