Kaidai Class Submarine

Kaidai Class Submarine

The Kaidai (海大型?) was a type of 1st class submarine operated by the Imperial Japanese Navy (IJN) before and during World War II. The type name, was shortened to ''Navy Large Type Submarine (海軍式大型潜水艦, Kaigun-shiki Ōgata Sensuikan?). All Kaidai class submarines originally had a two digit boat name, from I-51 onwards. On 20 May 1942, all Kaidai submarines added a '1' to their name. For example, I-52 became I-152. Ships are listed by the three digit boat name if they had one, two digit if they were not granted one or left service before 20 May 1942.