[xone]

These subs were sunk off the Philippines after receiving intel from the broken Jap code. I read the whole story from an intel side that talked about the sub cordon the USN set up to catch these subs. Can’t remember the doc.

[SunkenCiv]

Thanks xone! Amazing achievement -- they relied on intel and navigation without anything like GPS.

[SunkenCiv]

http://www.ussbatfish.com/patrol-6.html

https://en.wikipedia.org/wiki/USS_Batfish_(SS-310)#1943-1945