Hi Peter,
just checked the Trenchant and Swiftsures in SCU, and they work perfectly. Be sure that you go into the mission editor to select either one as playable in a specific mission, and it should be fine.
A long time since I looked at the 'perisher'. The mission you are describing is presumably tracking the boomer. Well, you do start in very shallow water, so check your depth carefully - your sub is probably not surfacing - it might already be there!
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