The checks are being carried out in the western part of the Kara Sea, deputy emergency minister Mikhail Faleyev told journalists. This is the area near former nuclear test site at Novaya Zemlya archipelago where K-27 nuclear submarine and one reactor from K-254 were disposed of in early 1980s. The disposal method involved sinking the sub and the reactor. The Emergency Ministry specialists will have to examine potentially dangerous sites, define the grade of their danger, and also find out the level of sea water and sediment pollution. After completing the expedition all the data will be included into the Register of Underwater Potentially Dangerous Objects. The specialists are conducting the research with the help of mobile complex of marine radiation control and remote controlled submersible AQUA-CHS, designed by Science Research Institute of Special Machinery Construction at the Moscow State Technical University. It was tested at the Black Sea prior to the current expedition.