The Thales 2087-towed sonar will give the LCS an ability to detect diesel-electric submarines while on the move, even better than destroyers and cruisers; because submarines can hide based on how sound is refracted through the temperature, salinity and pressure profile, the variable depth sonar can pierce that layer better than a hull-mounted sonar. The sonar is paired with a torpedo decoy under development. To destroy submarines, an MH-60S helicopter will deploy the Mark 54 Lightweight Torpedo. Submarine detection is achieved by using an active VDS and passive Multi-Function Towed Array (MFTA); the active sonar sends out an acoustic signal to analyze the return, while the passive sonar simply listens through the water for noise signatures.