Gas turbine

Gas turbine (5) comprises a main combustion chamber (10), a cooling system for air-cooling at least the guide blades (26, 29) and the guide rings (28, 38) of different stages (25, 27) of the gas turbine and/or a main gas channel. A further combustion chamber (34) is arranged in the hot gas main direction (H) behind the main combustion chamber into which is fed the cooling air (15) used for cooling a stage (25) arranged in front of the further combustion chamber. Preferred Features: The further combustion chamber has a closed cooling system (35) into which is fed the cooling air used for cooling a stage (25) arranged in front of the further combustion chamber.