I would use dynamic locations for that. Create you subs anywhere, and assign them a reasonable depth speed, and tactic.
Then, create a dynamic location (its on one of the drop down menus), and within the pages that are displayed for the location click the button to add a location; do this for each additional location you want to generate subs at. Inside the page assign all three submarines to the location (you only need to do this for one since they are linked) and for both Min and Max, enter 1 (so at least one and only one of the dynamic locations gets a sub assinged to it.
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