Description: Ocean-going Type IX U-Boat is cruising offshore while sailors open up a hatch where the dismantled gyro kite is stowed and quickly assemble it on deck. The pilot takes his seat and the Bachstelze takes off, flying high above the U-Boat before being winched back on deck by its towing cable. Film then shows the Bachstelze taking off again and landing and communication between the pilot and the U-Boat via a telephone cable.