Tensions are rising in the Strait of Hormuz, one of the world’s busiest sea routes. U.S. carrier strike groups now operate in these waters. Iran relies on its quiet “Black Hole” Kilo-class submarines.

For decades, Russia’s Kilo-class submarines were among the most recognizable diesel-electric attack submarines in the world. Known for their quiet operation and relatively low cost, the boats became ...

Add Yahoo as a preferred source to see more of our stories on Google. Ukraine’s domestic security service, the SBU, said Monday that it had carried out an attack on a Russian submarine in the Black ...

Add Yahoo as a preferred source to see more of our stories on Google. China's submarine fleet is improving, making advancements in stealth. In a war, China's subs could put up a tough fight in the ...

Twenty-four Kilo-class submarines were operated by the Soviet Union, of which eleven are still operated by Russia. One was sold to Poland, which remains operational, but another, sold to Romania, is ...

Ukraine’s domestic security service, the SBU, said Monday that it had carried out an attack on a Russian submarine in the Black Sea port of Novorossiysk, causing critical damage to the vessel and ...