 basically a balloon inside a balloon that can be pumped full of outside air from the surrounding atmosphere.Lala Shri Ram

Sir Shri Ram (27 April 1884 – 11 January 1963) was an Indian industrialist and philanthropist.He was the son of Rai Bahadur Ram Kishen Das Gurwale, the founder of the Delhi Cloth & General Mills, which remains one of the oldest firms in India today.