Klavesin-1R ("Harpsichord") 

The Klavesin-1R, or Harpsichord, is a deepwater autonomous underwater vehicle developed by Russia's Institute of Marine Technology. The vehicle is equipped with low-frequency and high-frequency side-scan sonars enabling it to survey the seafloor down to 6,000 meters.

According to the news site Defending Russia, the AUV will be carried onboard the recently renovated BS-64 Podmoskovie nuclear submarine. 

Klavesin on the atomic icebreaker "Russia" during 2007 Lomonosov range survey operations under the Arctic ice.