Container for housing and launching sonar buoys (sonobuoy), designed to be installed in a launch tube provided with a pneumatic system, said container including: a cylindrical casing comprising a first portion designed to contain a first sonobuoy of class G, and a second portion designed to contain a second sonobuoy of class G, said cylindrical casing including: - a proximal end provided with an interface with said pneumatic system of the launch tube, - a watertight intermediate diaphragm for separating said first and said second portion of the casing from each other, - a distal end provided with a cap for the watertight front closure of said second portion, - a pneumatic connection between said proximal end and said second portion of the casing, - valve means (14,15) automatically switchable from a first configuration, in which they place said pneumatic system in communication with said second portion of the casing by means of said pneumatic connection, so as to eject said cap and said second buoy from said container, to a second configuration, in which they place said pneumatic system in communication with said first portion of the casing, so as to eject said first buoy, wherein said valve means includes: - a spring closing device provided with watertight sealing means (22, 23) to allow or cut off the communication between said pneumatic connection and said second portion of the casing, characterized in that said valve means further comprises - a diaphragm closing device, to cut off or allow the communication between said pneumatic system and said first portion of the casing, in which said diaphragm closing device is in contact with said first buoy. a cylindrical casing comprising a first portion designed to contain a first sonobuoy of class G, and a second portion designed to contain a second sonobuoy of class G, said cylindrical casing including: - a proximal end provided with an interface with said pneumatic system of the launch tube, - a watertight intermediate diaphragm for separating said first and said second portion of the casing from each other, - a distal end provided with a cap for the watertight front closure of said second portion, - a pneumatic connection between said proximal end and said second portion of the casing, - valve means (14,15) automatically switchable from a first configuration, in which they place said pneumatic system in communication with said second portion of the casing by means of said pneumatic connection, so as to eject said cap and said second buoy from said container, to a second configuration, in which they place said pneumatic system in communication with said first portion of the casing, so as to eject said first buoy, - a proximal end provided with an interface with said pneumatic system of the launch tube, - a watertight intermediate diaphragm for separating said first and said second portion of the casing from each other, - a distal end provided with a cap for the watertight front closure of said second portion, - a pneumatic connection between said proximal end and said second portion of the casing, - valve means (14,15) automatically switchable from a first configuration, in which they place said pneumatic system in communication with said second portion of the casing by means of said pneumatic connection, so as to eject said cap and said second buoy from said container, to a second configuration, in which they place said pneumatic system in communication with said first portion of the casing, so as to eject said first buoy, wherein said valve means includes: - a spring closing device provided with watertight sealing means (22, 23) to allow or cut off the communication between said pneumatic connection and said second portion of the casing, - a spring closing device provided with watertight sealing means (22, 23) to allow or cut off the communication between said pneumatic connection and said second portion of the casing, characterized in that said valve means further comprises - a diaphragm closing device, to cut off or allow the communication between said pneumatic system and said first portion of the casing, in which said diaphragm closing device is in contact with said first buoy. - a diaphragm closing device, to cut off or allow the communication between said pneumatic system and said first portion of the casing, in which said diaphragm closing device is in contact with said first buoy.