surface. it has switches that start activating different deployments. there is dear in there packed in nicely. some of it floats to the surface there is a radio antenna that talks to the aircraft. and then the microphone, hydr are ophone is lit stening to a signal. they sent a cargo plane to indiana in recent days to deploy a cargo plane. anti-submarine mwarfare this is one of the tools that the navy has to look for and track the submarine. they need to find them and track them. on this mission, the buoys have been modified to detect sound in the range of black box