JDR Kolskaya Inspection

September 30 - October 13, 2012, Fertoing performed integrated navigational, hydrographic, and subsea engineering works in the area of the Sea of Okhotsk where the jack-up drilling rig (JDR) Kolskaya sank in 2011.

The aim of these operations was to locate the sunken JDR Kolskaya by sounding on the seabed in the accident area and carry out further inspection using ROVs.

The worksite was located in the Sea of Okhotsk, 280km NE of the Cape Terpeniya, Sakhalin Island.

The works were performed using a high-resolution Kongsberg ЕМ710 multi-beam echo sounder and the WROV TRITON XLX 150HP installed to the MSV Kendrick (Port of registry – St. Petersburg).

Operations were divided into 2 stages:

  1. September 29-October 2 – search and location of the JDR Kolskaya by sounding. The rig was located on September 30 with the first line at 1070m almost at the place of its submersion. Primary observation of the rig construction using the WROV.
  2. October 10-14 – thorough inspection of the rig construction using the WROV TRITON XLX 150HP with witness of the Russian Federation Transport Investigation Committee in the Far East representatives and victims’ relatives.


In total, there were 3 deep dives of 14 hrs cumulative duration.

Unique equipment and high technology used in these operations provided thorough expert analysis and technical navigational forensic expertise.