Though a bit unrealistic, my technique for evading pesky frigates in Scapa involves inviting them into shallow water to dance and letting the over zealous skippers ground their boats as they attempt to ram my submarine.
Cruise close to shore with just enough water under you to stay submerged without scraping bottom. Make lots of noise. The escort will line you up and punch it. Hit flank speed as late as you dare (ever play chicken with a train?) and if you time it right he'll scrape past your quarter deck and end up on the beach like a stranded whale. Then you can laugh at him as his propellors grab mud and rocks while he tries to reverse himself off the shore.
Resist the urge to surface and moon the hapless frigate crew. They are still armed to the teeth and will shoot to kill. Just pray you saved enough battery power to get out of scapa submerged and you're good to go.
Happy hunting.
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