As you aid before, the first volley is ten torpedoes, I am not sure why, or what to do in the sub attack .aix to fix it.

:hmmm:
Sound like this is an issue with the UK subs only - where is Gap when you need him:D
The German boats do not do this.

The aix - I would not suggest that you change it - just have a look.
You can see how it works like a flowchart.

1 - is contact an air unit - if yes follow command etc
2 - is contact a merchant - if yes do this etc
3 - is contact a warship blah blah

You can then follow down the script and see what the ai is being told to do under some conditions.
Is boat taking damage - if yes dive to 40m. Is boat taking damage and is underwater - if yes dive to 100m
etc

For some reason, when ever I use IRAI, they never give up, even after days and days, they never go away, is this a bug?
Because even when disabling limited O2 I can stay underwater for weeks, and they still don't go away or run out of ammunition. If this is a bug, I will cease to use this mod until it is fixed.
Recently, I only have been using IRAI for mission testing, and even then, If the destroyers of both sides Allies and Axis, find a submarine, they never give up.
Making this mod more of a hindrance instead of making it more realistic.

If the DDs are from a convoy, they will stop when they no longer detect you for 30 mins. Also if the convoy gets #km away, they will reform their convoy duties. SO you need to make less noise and/or go deeper.

If it is a HK group attacking you - this will take longer. They dont give up so easy

Sorry guys, I don't think this bug is related to submarine setting, and I don't know anything about AI scripting. Nonetheless, if there's a British subs-related problem with IRAI, I am sure TDW will try to track it down when he will be back.

Yes, as said by Trevally, DD's AI is affected by their role in campaign. Unfortunately not everything can be tested effectively in single mission :yep: