http://en.wikipedia.org/wiki/Marjata
Marjata is a purpose-built electronic intelligence collection vessel (ELINT). . . . [O]perated by the Norwegian Intelligence Service, and is considered to be one of the most advanced ships of her kind in the world. Her main role is surveillance of the Russian Northern fleet`s activity in the Barents Sea, but is constructed for operations all over the world.
she is also built with a very low noise signature, so that the ship itself does not interfere with the onboard sensors. Marjata also has large internal bay for computing and analyzing of reconnaissance data. The ramform type ships are often used for seismological surveys of the seabed. Marjata is well suited for operation in arctic conditions for prolonged periods of time.
She is the third ship that bears the name Marjata, all of which has been used for military intelligence purposes by the Norwegian Armed Forces.
. . . The various ships that have borne the name Marjata has always been looked upon with disapproval by the Russian and former Soviet, authorities.The ship was also in the area when the accident occurred. It was located 19 kilometers away when it was registered an explosion that was interpreted as a “soft explosion”. A little while later an earthquake measuring device picked up a second explosion which is thought to have occurred when Kursk hit the seabed. This secondary event is estimated to be equal to two tons of TNT
During the salvage of the Kursk, there was also considerable disagreement about Marjata’s position and actions.