NASA's scientific balloon team

NASA's scientific balloon team in New Zealand is preparing for the fourth flight of an 18.8 million cubic foot balloon, with an aim to achieve an ultra-long duration flight of up to 100 days at mid-latitudes. Longer-duration flights provide the opportunity for longer observations of scientific phenomena or ability to survey more sources.

http://www.aerospace-technology.com/news/newsnasa-prepares-for-new-balloon-flight-in-new-zealand-4830962