The Kasteelborg and the Kroonborg will carry out maintenance on the dozens of unmanned platforms that NAM and Shell UK operate in the southern sector of the North Sea. The intention is to have the Kroonborg carry out all the major maintenance work. The Kasteelborg will join the Kroonborg in performing unplanned interventions and ad-hoc jobs. The partnership between the Royal couple Kroonborg and the Kasteelborg is unique in the offshore maintenance world.