http://people.artcenter.edu/~berk/alavs/#abstract
They call it art, rather than technology, and when you watch the video's, you have to agree it is beautiful, the majestic movements, the whale-like sounds...
Of course, I had to think about Mars rightaway... Martian atmosphere, although thin, is mainly CO2, so it is quite heavy, there's a wide choice for buoyant gasses to choose from: Helium, Nitrogen, Hydrogen, Oxygen... CO2 not being an oxidiser, using Hydrogen would be a safe option. Downside (there's always a downside) is of course that these blimps would be quite huge if you wanted a usable payload attached...
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