North Sea oil bosses will later today face disgruntled rig workers following an unofficial strike at the weekend over working conditions on a multi-billion pound Statoil project.
The management of services company Aker Solutions will travel almost 100 miles off the coast of Shetland to the Mariner platform.
It comes after workers downed tools over the weekend and threatened to escalate action unless their demands are met.
A four-hour sit-in took place on Saturday morning and again on Saturday evening without the involvement of trade unions. James Furie, a representative for the workers, has claimed that as many as 200 workers from Aker Solutions took part in the strike alongside 50 workers from Stork, a subsidiary of services group Fluor.
“The workers are protesting against poor working conditions, poor management, possible blacklisting and having an offer of a bonus removed,” Mr Furie said.
“This action will escalate if Aker and Statoil think they can continue to treat us this way,” he added.
A major escalation at the rig could potentially delay the start of oil production.
This is expected in the second half of this year and reach production rates of 55,000 barrels of oil a day for the next 30 years.
A spokesman for Aker Solutions declined to comment on the number of workers involved.
He said the Norwegian services group was “made aware” of the strike, but has received no official notification, and confirmed it is looking into this matter.