Vortexpedo

Vortex rings can be made and controlled by dolphins and whales for play.
[link]
This trait seems to be a learned one rather than an instinctive behavior and is far more prevalent in the female of the species than in the males.
As far as I have been able to find this is attributed to the males being more interested in their own social structure and just can't be bothered to learn how make them on their own.

I think that this assumption is a mistake.

So the theory potion of this idea is that the smaller female porpoise are able to reach and maintain auditory frequencies that are more difficult or impossible for most of the males to create.

Humans can create vortex rings in water as well and there are patents pending on exactly how it is done but these vortex rings are not maneuverable in the way that they are for porpoise.

I propose that the dolphins use sound waves to either tap and amplify sound waves within the spinning troroidal column of air from its outside in much the same way that we would roll a hoop along the ground with taps of a stick, or they rotate an emitted cone of sound from within the center of the vortex ring to control its movement in the way we would control a hula hoop.

Perhaps they do both simutaneously.

Porpoise would then be limited as to the size, cohesiveness and range of these rings based upon the distance of the rings from the porpoise themselves.
Once we learn the frequency and focal point of the sound-waves produced to keep these rings cohesive, we should be able to direct gaseous torus shapes over vast distances through almost any medium by changing the pitch and the shape of the emitter.
Cutting the sound waves would cause air rings to lose cohesion and rise to the surface within water.

Directing a large continuous stream of these rings along the sternward path of a ship would have the same effect as a directed depth charge, as a portion of the hull would then become supported by nothing more than bubbles, causing a ship or sub to dive or break in half.

Normally I wouldn't post an idea that I could only think up an offensive use for, but... if I thought of it then it means that some other schmuck is already tinkering with it and it should be a fairly easy attack to counter as long as there is a heads up.

I also feel that there are incredible applications for these ring phenomena using waves within substances other than air and water, but the logical starting point to me seems to be trying to mimic what the dolphins are doing.

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Anybody out there in the auditory sciences have a buddy that works at an aquarium?...
or vice versa?