https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2131701160

Convoy raiding groups generally consist of 12 submarines. 2 Reconnaissance Cruiser Submarines for locating targets with modules set for maximum surface detection and minimum sub visibility. Plus 10 Attack submarines to execute engagements with modules set for maximum torpedo attack and minimum sub visibility.

The two cruiser Submarines were sunk in the first engagement just prior to this one. They're slower and the aircraft facility modules give them lousy sub visibility stats. No matter. They did their job and the Japanese committed the bulk of their fleet to the engagement. The attack submarine group was set to never retreat and proceeded to sink the bulk of the escorts and a few battleships before the carriers along with the rest of the group retreated.

This engagement shows the challenges of balancing these modules. A sub visibility value of 2 allowed this tiny fleet to decimate the Japanese navy in a single engagement without loss. Note: these are late war modules and hulls being used in 1941 so its already a bit out balanced. Still, i'm exploring reducing some of the sub vis bonuses to add a bit more balance.