Simplest way to deal with patrol craft is to sink them with torpedoes. After that consider "periscope depth" as a variable - with GATO and later subs inside harbors you often run aground at 66 feet, so come up to 55 feet and use the page up/page down keys to just raise the scope above the surface. Whatever it takes, as long as the tops of the periscope shears are below the surface the only thing you need to worry about is depth charges. And the best way to avoid depth charges in shallow water is to sink everything in the area that carries depth charges.
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