In 2009 I was fortunate enough to visit the Ceduna Bureau of Meteorology station in far west South Australia to see a weather balloon launch. The procedures and safety aspects are quite interesting - and probably give further pause to considering hydrogen for Project Horus.
Production Notes: Shot hand held with camera only audio
Camera: Sony HDR-HC9 HDV Camcorder
Editing: Adobe Premiere CS5 + Mercalli V2 stabilisation