The Kaidai Type VI, also called the I-168 class, was built under the Maru 1 Programme and the Maru 2 Programme. They were faster than their predecessors, having the highest surface speed of any submarine in the world in the mid-1930s. However, their speed was surpassed slightly by later IJN submarines.
−
The Kaidai Type VI, also called the I-168 class, were built under the Maru 1 Programme and the Maru 2 Programme. They were faster than their predecessors, having the highest surface speed of any submarine in the world in the mid-1930s. However, their speed was surpassed slightly by later IJN submarines.
+
The Kaidai VI contributed to sinking two USN aircraft carriers during World War II.
−
The Kaidai VI contributed to sinking two USN aircraft carriers during World War II.
+
This class was further break up between the sub "a" and "b" types, with slightly modified designs.