After a service life of over 90, it was necessary to overhaul the large lock at Brunsbüttel providing access to the Kiel Canal. The insular situation of the construction site is a particular challenge as well as the fact that the lock is a part of the first line of dikes so that the protection against offshore floods was of great importance.
The size of the chamber was dimensioned in order to allow for large seagoing vessels to pass into the Baltic region. In special cases, the lock is navigable up to a width of approx. 44 m and an aft draught of up to 11 m. The flood-gates were designed so that it is possible to navigate over them.
The task further included the adjustment of the outer harbour, the modification and extension of mole 2 and of the piers on the Elbe and the canal and the required ground storages.