Underwater warfare

They first came to prevalence during the First World War, when German U-boats attacked and sank many allied vessels, such as the sinking of the Lusitania in 1915.

A similar scenario occurred during the Second World War, when German U-boats launched a prolonged campaign against Allied shipping, especially in the mid-Atlantic.

Japanese submarines also played a minimal role on the Pacific front, and American submarines sank a total of 5.3 million tons of Axis shipping throughout the war, most of which was scored against the Japanese.

[4] Seabed warfare is defined as "operations to, from and across the ocean floor.

"[5] In general the target of seabed warfare is infrastructure in place on the seabed such as power cables, telecom cables, or natural resource extraction systems.