Some company Air Swimmers launched the original thing. Managed aeronautical means in the form of fish (I hope, the range will soon diversify). So elementary thing that captures the spirit, how effectively everything turned out. Judge for yourself - the frame - is an inflatable foil, filled with helium to achieve "neutral buoyancy", i.e. when the structure itself does not rise either up or down. In the tail is a servomotor that moves the "tail." Under the belly there is a moving balancer for a heel (from the audience it is suggested that this is not a roll, but a pitch) forward or backward (well, neutral). Plus, a simple controller that receives a signal from the remote control (on IR, 2 channels) and gives commands to the server. The fish feeds on one AAA battery, plus three - in the remote.
Well, the most interesting is video. ')
PS I'm not sure what this blog is about, but it seems to be manageable things, though without their brains so far. If anyone can tell a more suitable blog - well in a personal.
PPS The official site already lies, even without Habr :-)