PhotogaleriesVANYA I & II class gallery 2019-04-082020-09-22 Javier In the design of Vanya classes, special emphasis was placed on reducing the signatures that made them more vulnerable to mines. The 257D series were made of wood, but the other variants were built in steel with a low magnetic signature. In the mid-1960s the 257DM variant appeared, able to take over mines with magnetic-acoustic fuses and active mines or “rising mines” with contact fuses combined with acoustic fuses. After modifications applied in the 257DM and later classes, these ships had three methods for the neutralization of magnetic-acoustic mines. These methods were of the “loop coil/acoustic”, “solenoid/acoustic” and “contac/acoustic” type. They also managed to operate with heavier sweeping systems such as “barge-sweep” against pressure mines, and “twin bottom contact sweeps” against bottom mines. In 1965, five Project 699 or Vanya II class vessels were built in the Kolpino Shipyards. These vessels were a bit longer and displaced 40 more tonnes than the Vanya I class. They had the same range and armament but their complement was only 22 people. Both classes carried about 12 naval mines for minelaying purposes.