I'm also a librarian :up: as well as a maritime buff. So both go hand in hand

Its also worth noting that the Japs were absolutely inept at convoy protection, it was not a priority for them as it was seen as being defensive rather than in the offensive spirit and so it received few resources (and what resources it got were frequently squandered by interservice rivalry).

The US sub force also had the advantage of getting help in training and doctrine from the Brit, Canadian and US Atlantic ASW forces.