This isn't an unusual practice for the world's navies ... The SM U-1 was built before the war, and Germany decommissioned it before the submarine saw a single battle. When WWI kicked off, the ...

Meanwhile, below the waves, German submarines sought to sink supply ... The Battle of Jutland was the largest naval battle of World War One. The battle took place in the North Sea off the coast ...

On January 17, 1955, the USS Nautilus transmitted a historic message: "Underway on nuclear power." As the world's first nuclear-powered submarine, Nautilus could remain submerged for two weeks at ...