Project 1710 Mackrel
Beluga class
The single Project Beluga-class experimental submarine featured a hull shape similar to but smaller than that of the nuclear propelled Sierra-class, with a sail similar to that of the Alfa-class. This research and development platform may have been used for testing an air independent propulsion system, as well as for tests of hull forms, propulsors and boundary layer control techniques. Last noted in operation in 1997, this trials submarine is believed to be inoperable or discarded as of mid-2000.
