Star of Alaska (Balclutha) in floating drydock, circa 1954-1955 / steel hull full-rigged ship built 1886 now part of collection at the San Francisco Maritime National Historical Park [2544×2539]

Star of Alaska (Balclutha) in floating drydock, circa 1954-1955 / steel hull full-rigged ship built 1886 now part of collection at the San Francisco Maritime National Historical Park [2544×2539]

Floating Drydock YFD-6 (center section) under tow in the Culebra Cut, Panama Canal, circa 1945. To permit passage through the canal locks, Navy SeaBees turned YFD-6’s center section on its side. Add’l info in comments. [926 × 743]

Floating Drydock YFD-6 (center section) under tow in the Culebra Cut, Panama Canal, circa 1945. To permit passage through the canal locks, Navy SeaBees turned YFD-6’s center section on its side. Add’l info in comments. [926 × 743]

Why not bring your own drydock? Wind turbine installation vessel TAILLEVENT of Jan de Nul Group enjoying the last sunrays at Oostende harbour, Belgium

Why not bring your own drydock? Wind turbine installation vessel TAILLEVENT of Jan de Nul Group enjoying the last sunrays at Oostende harbour, Belgium

The future littoral combat ship USS Tulsa (LCS 16) rises level with the Mobile River as the BAE Ship Systems drydock floods during the final stage of the launch process. USN photo. 16 March 2016 [1600 x 1067]

The future littoral combat ship USS Tulsa (LCS 16) rises level with the Mobile River as the BAE Ship Systems drydock floods during the final stage of the launch process. USN photo. 16 March 2016 [1600 x 1067]

USS Rexburg (EPCE[R]-855) and USS Marysville (EPCE[R]-857) share the drydock at Long Beach Naval Shipyard with the USS Stone County (LST-1141) in April 1969. [1500×1183]

USS Rexburg (EPCE[R]-855) and USS Marysville (EPCE[R]-857) share the drydock at Long Beach Naval Shipyard with the USS Stone County (LST-1141) in April 1969. [1500×1183]

Coast and Geodetic Survey vessel USC&GS CARLILE P. PATTERSON in drydock at Honolulu. Built in 1883 at Brooklyn, New York, primarily used as a hydrographic survey vessel in the Pacific. [1500×738]

Coast and Geodetic Survey vessel USC&GS CARLILE P. PATTERSON in drydock at Honolulu. Built in 1883 at Brooklyn, New York, primarily used as a hydrographic survey vessel in the Pacific. [1500×738]