Two Baltic Fleet minesweepers, identified by the Russian Ministry of Defense as the Pavel Khenov and the RT-25, were active near Saint Petersburg. As part of their anti-minewarfare training, both minesweepers had to ensure the safe passage of naval vessels moving out of the naval base through an enemy minefield. Both minesweepers searched a grid for both bottom and anchored sea mines which after detection were destroyed. As a final part of the exercise, the minesweepers used ship mounted machine guns to engage and destroy floating sea mines.