Germany's first U-boat (U1) was taken & modified from a group of export models bound for Russia during the Russo-Japanese War in 1904. U1 was commissioned into the German Navy in 1906.
Most western countries use a special steel alloy that is designed to withstand not only the high pressures experienced when submerged but also the constant changes in pressures experienced when...
The modern military submarine is used in a number of roles. Note that the word submarine for the larger vessels that operate independently for extended periods. The smaller ones are more correctly...