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Super Flood Basin is Filled Supporting Docking of USS Cheyenne
KITTERY, ME. April 12, 2022, Portsmouth Naval Shipyard: USS Cheyenne (SSN 773) makes history as she becomes the first attack submarine to utilize the newly constructed Super Flood Basin to enter Dry Dock #1 without the use of buoyancy assist tanks and independent of the Piscataqua river tides. The drastic difference in water level between the Super Flood Basin and the surrounding river can be seen at the lower left of the photo. (U.S. Navy photo by Jim Cleveland/Released)

Photo by: Jim Cleveland |  VIRIN: 220412-N-TT535-002.JPG