Active send actual acoustic pings through the water looking for the return off of a submarine's hull, while passive buoys allow for listening for the sounds made by submarines. There are a number of types of sonobuoys that do different things, but they all fall primarily into two classes, active and passive. A video that came to our attention via on Twitter, shows exactly that, with one advanced sonobuoy going through a total metamorphosis of shape and structure once at depth. We see them chucked out of maritime patrol aircraft and helicopters over and over again, but we really haven't seen how they can transform once in the water. Sonobuoys are absolutely critical tools in a Navy's efforts to keep enemy submarines at bay.
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