Comment Hydrogen blimps (Score 1) 200
I don't see why they would use helium. Hydrogen would be much easier to deal with since it can be readily extracted from the hydrogen sulfide clouds. There wouldn't be any Hindenburg's since there's no oxygen in the atmosphere to react with.
It's also more bouyant, so the gas bag would be smaller for the same weight, and you could launch it from earth with less delta V.