Voyage to the stratosphere
"The UK duo, Colin Prescot and Andy Elson, will attempt to set a new world balloon altitude record in July.
They hope to get to a height of 40,000 metres (132,000 feet) in the largest helium balloon ever constructed."
http://news.bbc.co.uk/hi/english/sci/tech/newsid_1967000/1967277.stm