In OM & DW, the submerged sub does not have the capability to shoot torps, and of course is not fast enough generally to keep up with a convoy, once the player gets within spawn range, but the surfaced ones might have an active deck gun, I just haven't looked at them. However, they are both Type=200 vessels, and as such are not particularly aggressive. It would be easy enough to copy what CapnScurvy and s7rikeback did with the FotRSU torp guns and deck guns from FotRSU and apply that to DW, then you would have a pack of convoy-attacking doberman pinschers whenever the player gets within range...
