DOF's fourth-quarter loss does not tell the full story of its performance, with high utilisation, rising revenue, strong Ebitda and a mountainous backlog of contracts proving positive indicators.

Oslo-listed DOF has maintained an average book-to-bill ratio of 1x during the difficult years from 2014 to 2016, meaning it has been replacing contracts nearly one-for-one as they rolled off.

The group's backlog of firm deals stands at NOK 23bn ($2.9bn),