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Intermediate Submarines

Which submarine introduced the teardrop-shaped hull that became standard for high-speed underwater vessels?

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Intermediate Submarines

Which U.S. Navy submarine was the first to complete a submerged transit beneath the Arctic ice cap?

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Hard Submarines

Which submarine class was the first to use operational hydrogen fuel-cell air-independent propulsion?

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Hard Submarines

Which French submarine was the largest submarine built before World War II?

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Intermediate Submarines

Which submarine became the first ballistic-missile submarine to conduct a deterrent patrol?

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