South Stream Transport B.V. (in charge of gas pipeline Turkish Stream construction) signed a contract with Swiss company Allseas Group S.A. for construction of the first line of the offshore section of Turkish Stream with an option for construction of the second line, according to Gazprom.

Under the contract, Allseas must lay more than 900 km of pipes on the seafloor. To perform this operation, the company plans to use the world’s largest construction vessel Pioneering Spirit.

“Allseas will start laying the first line in the second half of 2017,” the report said.