Improved North Sea rates have spurred owners to move two more OSVs out of layup.
Broker Westshore said Bourbon's 4,800-dwt platform supply vessel (PSV) Bourbon Mistral (built 2006) is back in the game after being stacked for 926 days in Bergen.
There are now a total of 52 PSVs operating in the North Sea, against 32 still laid up.
Utilisation is running at 87%, while rates are £16,000 ($20,300) per day.
The 285-bp Siem Offshore anchor-handler (AHTS) Siem Diamond (built 2009) has also been brought out of layup from Montrose in Scotland, where it had languished since July 2015.
There are still 35 AHTS units stacked, with rates at £45,000 per day.
Westshore also said a PSV bought last week from Ulstein Group by Sverre Farstad's new venture, Sverre Farstad & Co, has been reactivated and booked in-house from 4 July.
The 4,100-dwt Blue King (built 2015) has been renamed Farland.
It spent 1,563 days laid up in Bergen - since March 2015.
