If I'm not mistaken. The used to put food on tow along (fake) periscopes to entice the seagulls to swarm it. Over a period of time the sea gulls would associated this metal pole sticking out of the water with food. Therefore, if the uboat was in a harbor and the birds saw the scope, they would swarm and this would alert the looks outs. This is what I heard, do not know if it was true.
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“You're painfully alive in a drugged and dying culture.”
― Richard Yates, Revolutionary Road
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