Taking on a destroyer alone is deadly....
But taking on a little armed trawler is deadlier.
Explanation
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Although your U-Boat may be big and strong with a large crew , 4 front torpedo tubes and 2 aft torpedo tubes , a deck gun and 2 flack guns. You sail your nations colours and the most deadliest thing on a uboat is the human mind of the captain. When the seas are rough and storm rains fire down, the little armed trawler can barely move , but during the day the armed the trawler can take pops at you with its cannon and call upon reinforcements if it's needed I.E .Destroyer , pt boat, plane , ect.
when fighting it from underneath, it can also use its ultra viloet sonar detection system to find you, or 'PING' you. once its found you, it will have a go at you with its depth charges and then if it can't get you alone it will call for back up.
So think twice , even the least deadliest ships can soon become the deadliest!
chris,