Navy Retires 40 Year Old “Secret” Sub

Launched in Groton, Conn., in January 1969, for years NR-1 was a secret submersible built to dive so deep it had wheels for moving along the ocean floor. Because of its nuclear reactor, its dwell time was not limited by batteries like other submersibles. But it was not fast, managing a little more than 3 knots submerged.

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