Whether tied up alongside in a foreign port or passing through high risk areas such at the Straits of Hormuth, even the advanced warships are vulnerable to terrorist attacks. Suitably placed High Definition Sonar affords protection from the underwater threat. Echotec's high bandwidth sonar design provides 360 degrees of coverage against the sea mine during transit, and the underwater intruder when tied up alongside or at anchor.

Naval vessels are at risk when operating from foreign ports. Local security measures may not meet the requirements for the active threat level. The underwater diver may approach the ship unnoticed and place ordinance on the hull below the waterline. Echotec's 3-D HDS design provides a mode for detecting the underwater threat. Once observed an alarm is presented to the ships security forces. Large ships such as Aircraft Carriers may be equipped with two transducers to provide sufficient coverage around the vessel.