Enemy forces are constantly listening with floating sonobuoys, sonar mines, passive arrays towed by ships and subs, as well as active sonar from those vessels.

• 因为敌军不断以浮在水上的探音浮标、声纳水雷、船只和潜艇拖曳的被动阵列，以及这些船只装载的主动声纳等，持续监听水中动静。