Oslo-listed Subsea 7 will keep the 13,753-bhp Skandi Neptune (built 2001) for an extra year after exercising an option.
It was originally booked for three years in 2010, at a reported $40,000 per day in the Gulf of Mexico.
Dof Subsea enjoyed a record start to 2014 booking its best ever financial performance.
Operating income in the first quarter hit NOK 1.45bn
