**After the gauge is cleared, the boss composition will be significantly nerfed except the submarine was replaced by a stronger one. One destroyer should equip one sonar, one depth charge projector and one depth charge to maximize OASW damage. | **After the gauge is cleared, the boss composition will be significantly nerfed except the submarine was replaced by a stronger one. One destroyer should equip one sonar, one depth charge projector and one depth charge to maximize OASW damage. |