Norway's Wilhelmsen is moving into the "sustainable" deepsea mining sector in a bid to capture a slice of $100bn of domestic business.

The maritime services group and its offshore subsidiary — NorSea — have together bought an 18% stake in what it calls the "innovative" Norwegian operator, Loke Marine Minerals.

Loke was set up in 2019. Wilhelmsen said the company has developed "minimal-impact" robotics solutions in a sector that has caused opposition among green groups.