MB (Main Tug) - a twin-screw tug with diesel engines, the middle location of the engine room, river-sea class. Vessels have ice reinforcement of the hull. Tugs were designed to drive trains from bulk or dry cargo barges.
Projects 07521, then project C0751since 1992, were produced at the Kama Perm Shipyard. Register class: KM * LU2 IISP A3 tug. The author of the project of the Central Design Bureau Vympel.
Between 1986 and 1994, 33 vessels of project 07521 were built. Late ships received personal names, the rest - numbers starting from the head number 1201 (MB-1201 - the head ship).