I am trying to test that very behavior right now merc4ulfate. Part of the problem is that they have to "see" your submarine or periscope, or have a hydrophone, of which I'm not sure how many have those in FotRSU... I suppose we could take inventory of that... did Ducimus have depth charge racks on any merchants? I don't remember if he did or not... ??
- maybe that was Traveller...