Dof Subsea has penned a series of charter contracts for offshore support vessels tipping the scales at over NOK 520m ($90m).

Oslo-listed Subsea 7 has exercised an option to extend the 5,900-dwt construction vessel Skandi Seven (built 2008) by one year from 31 March next year.

The same company has also decided to keep the 364-tbp anchor handler Skandi Skansen (built 2011) until July 2013.

Dof’s