BASE jumping refers to the sport where someone leaps off a fixed surface (building, antenna, span, and Earth) and flies to safety by using a parachute. It has been described as a thrill from enthusiasts, and incredibly dangerous by most everyone else.
The term was coined in 1981 by Carl Boenish, who is described as the father of the sport.
His life is documented in a new documentary titled Sunshine Superman.
We spoke about the film with its director, Marah Strauch, and we asked her to tell us a bit more about her subject - Carl Boenish.