P-3 Orion deploying a sonobuoy - GIF

[Altair]

P-3 Orion deploying a sonobuoy. A sonobuoy is a portable sonar system used in anti-submarine warfare or underwater acoustic research.




More:

https://en.wikipedia.org/wiki/Sonobuoy


Previously:

steam-powered submarine
The H.L. Hunley, the first submarine to sink a warship
Disarming WW2 German mine - video

[12bolts]

Well theres a lot more inside 1 of them than I imagined!

[CharlesWaugh]

I assumed that the last stage of deployment shown is a series of microphones. With many microphones and by measuring the difference in timing of a wave front hitting them, one can determine quite accurately what direction and how far the initial impulse came from.