sentences:  The developments - a new South Dock east entrance lock and three passages to link the Millwall, South, Export and Import Docks - were divided into four contracts, and were completed in 1931 at a final cost of £1,311,981 for the dock works, considerably improving access to the docks.South Dock regularly plays host to medium-sized military vessels visiting London as it is the furthest point upstream that they can be turned around - courtesy of the reconstruction worked carried out in 1926-1931.There is no longer a route for vessels across the Isle of Dogs - only the reconstructed eastern entrance remains.