What was the significance of german u-boats wwii and to world history in general. what impacts of the german u-boats can still be seen today? this should be one paragraph in length.

The German "u-boat" aka the Submarine was highly effective due to having the element of underwater travel. This way, they could sneakily send missiles at other naval ships without risk of detection. These days, submarines are an essential part of naval force, and underwater detection systems are being created in order to detect these more often.

it was on the rise and doing very well and would continue to do well until the great depression from 1929-1939

during world war ii