Only four shipyards in Germany had slipways large enough to build the six new battleships. There are no slipways or harbours in the MPA. It had 50 slipways, seven wet docks and a detention basin. There are three slipways and a fitting-out jetty. At the time Hog Island was the largest shipyard in the world, with 50 slipways. Low speed maneuvring is necessary between slipways and buoys and take-off and landing areas. Later mechanical winches and slipways were introduced. For the first four slipways and one floating dock, workshops, magazines etc. In 2015 work to refurbish the 1935 boat repair slipways was initiated. Two ships were being assembled in Trieste's slipways, and more were in preparation. The bomb load of 4,000lbs was successfully dropped on the submarine slipways. This work included the construction of slipways for boat repair. Six ships could be under construction in slipways at one time. Slipways and harbour improvements were also constructed. The two new slipways were numbered 2 & 3.