re: #120 Dark_Falcon

The IJN had first-rate torpedoes, but they were well behind the USN in the fields of radar and sonar, an imbalance that only grew worse over the course of WWII.

Yeah. It looks like the I-400 wasn’t ever used operationally (honestly I only knew about it from the Hearts of Iron game series) but it seems like it would have been big and dense and noisy. Easy to find.