Is the german term that describes the submergible watercraft that they developed and used extensively for world war i.

Answer;

U Boat

Explanation;U-boat is an anglicised version of the German word U-Boot. It is the shortening of underseaboat. It describes the submergible watercraft that they developed and used extensively for world war i.German began to employ U-boats to break a stalemate at sea. U-boats were traveling under water ships.They were used to sink British supply ships with no warning. Due to the British blockade, with it's fleet bottled up, Germany had to use U-Boats to get at the British lifeline across the Atlantic.

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