OSV owner Siem Offshore has offered to buy back bonds to end a debt-restructuring impasse.

The company said it would exchange outstanding notes in the NOK 600m ($76m) five-year issue maturing this year for bonds in the NOK 700m series due in 2019.

These will be convertible at 80% of par value, in line with the changes already agreed to the 2019 issue by investors.