The USS Sargo, a Skate-Class submarine, was designated for an Arctic cruise. She received alterations to strengthen her sail before she left the building yard.
Passing through the Bering Strait, by the Diomede Islands, and crossing the Arctic Circle, the Sargo arrived at the North Pole at February 9, 1960 ; she began searching for thin ice, and surfaced 25 feet from the pole, through 36 inches of ice.
The following morning, USS Sargo submerged and departed the pole. The expedition proved the following points:
1. The submarine guidance system could be rated at pinpoint accuracy.
2. The submarine can travel submerged through the ice-locked Bering Straits in midwinter.
3. The submarine can reach the North Pole from east or west at any time of the year.