Flexible mast is a must
See the flexible mast in action at the KoMo project
July 2014 C/S Nexans Skagerrak was upgraded at Örskov yard in Denmark. One of the modifications was crucial for the Kollsnes-Mongstad (KoMo) project - a flexible mast.
In the video below you can see the flexible mast in action at the KoMo project when C/S Nexans Skagerrak passes under a bridge with only 26 meters sailing height in Lurefjorden spring 2016.