The vessel will be responsible for the deeper water section of the route from Russia to Turkey. Last month, Allseas’Audacia started pipelay near the Russian coast – it will also undertake pipe pulling through micro-tunnels.
TurkStream will comprise two parallel gas pipelines extending for 930 km (578 mi) across the Black Sea, each with a diameter of 81 cm (32 in.) and annual throughput capacity of 15.75 bcm.
According to Gazprom, it will also be the first pipeline of its size to be installed in a water depth of up to 2,200 m (7,218 ft).
One of the pipelines will supply the Turkish market, while the other will take Russian gas to the Turkish-Greek border for onward delivery to markets in Europe.
First gas should flow through the system by late 2019.