Norwegian OSV and subsea group Dof has posted a bigger loss in a weak fourth quarter market.

The net deficit to 31 December was NOK 853m ($108m), compared to NOK 714m in 2016.

Revenue edged up to NOK 1.79bn from NOK 1.77bn, but operating expenses rose more quickly to NOK 1.34bn against NOK 1.28bn.

Its EBITDA totalled NOK 610m, down from NOK 695m.