The installation of the lock gate chambers is an important part of the project. The two chambers the gates will roll into when ships pass through the locks will be installed with the help of caissons. A caisson is a concrete construction that is lowered by digging out the soil below the construction. This work takes incredible precision, since the gates of the sea lock will be attached to these at a later stage. The lock gates have a height similar to a 6-storey apartment building.
In order to ensure the caissons of the new sea lock end up in the right place, four DOP pumps are deployed to dig out the soil below the caisson. These DOP pumps are powered by four power packs built by Hycos (part of the Hydrauvision Group). The Hydrauvision location in IJmuiden performs maintenance on these power packs during the digging process.