Below you may find the During World War II U-boats improved these weapons from the G7a model which left a trail of bubbles as it headed for its prey which is part of the Jeopardy Archive. In case the question or answer is wrong or something is missing do not hesitate to contact us and we will be glad to help you out. This question was last seen on March 30 2023 Jeopardy! TV Game Show.

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