Japanese Submarines in World War Two

The Imperial Japanese Navy developed the submarine faster than any other country in the world. But as a result of rivalries between the two military hierarchies, the Army and the Navy, they never utilized the submarine to its full extent. Nevertheless, during the Second World War, Japan deployed a number of unique submarines. These included the Type B1 which carried a Yokosuka E14Y1 reconnaissance seaplane in a watertight capsule attached to the deck of the submarine. One of these aircraft carri