The Saipem 7000 semi-submersible crane vessel has been stabilised after listing heavily in a Norwegian fjord on Thursday, causing a security alert.

The vessel, owned by Italy’s Saipem, has since returned to a "stable and safe condition", the company said.

Saipem said in a release that the incident occurred while the vessel was performing the planned five-year load test of the main cranes. The vessel had just completed dynamic positioning tests overseen by classification society DNV.

Saipem noted the load test was done "under the attendance of the classification authority".