Pressure Rated News Today

>> reporter: and how deep down can these go? >> these are pressure rated to go to the bottom of the ocean. so you can put things on a remotely operated vehicle that mayfly to the bottom or an autonomous vehicle. theyre both able to do that. >> reporter: this is a hydrophone. thats where you would start if youre looking for the ping. lets say it gets to the situation where the ping has stopped, the batteries have run out. then they just have s.o.n.a.r. how does s.o.n.a.r. work? >> this is much di...