Various shots from different angles aboard Canadian weather ship "Quadra" of men blowing up and releasing small weather balloon. Various shots of people in motorboat approaching the "Quadra" one of them is a NFB cameraman Don Virgo shooting with a film camera. LSs, ELSs of other weather ships at sea. Various shots on deck of the "Quadra" of men pulling down big weather balloon with help of several ropes attached to it, of men pushing balloon into large shelter and pulling on doors to close them.