The graving drydocks in Yokosuka, Japan are part of the naval base that has been managed by the United States Navy since 1945. The narrow basin is filled with water and then opens its gates allowing a ship to enter. The gates are closed and the water is pumped out, leaving the vessel supported on blocks. When the work on the ship is finished, water is allowed to re-enter the basin and the drydock gates are opened to allow the ship a safe exit. After completing a double Ocean Station Victor, the USCGC Winnebago headed to Yokosuka for a 1-month overhaul in drydock. In this picture, the drydock gates can be seen behind the Winnebago. 

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