IJN Submarines & MTB Sections

Submarines: The Kaidai-7-class, or KD-7, was developed in the late 1930s, following on from the preceding KD-6 class. With a surface range of 8,000nm at 16kts, and a submerged endurance of 50nm at 5kts, they possessed a slightly better underwater performance to the late-model KD-6s and better surface speed (though not