It was built by Rauma-Repola in Pori, Finland in 1985 and was owned by the Russian company ArktikmorNeftegazRazvedka (AMNGR), a subsidiary of Zarubezhneft.

[2] On December 18, 2011, the rig, which was under tow during a fierce storm, capsized and sank in the Sea of Okhotsk.

The incident happened some 200 kilometres (120 mi) off the coast of Sakhalin island, in waters more than 1,000 metres (3,300 ft) deep.

"[5] A search and rescue effort began as soon as the rig sank and was halted five days later on December 22.

[6] With 53 declared missing or dead, it was the largest number of casualties in an accident the Russian oil sector has ever experienced.