measures are possible which prevent a person from being mistakenly locked inside a wind power installation and thus exposed to a nitrogen atmosphere that can be implemented for example by motion sensors such as infrared sensors an additional or alternative measure can be expressly signing in and signing out of any person who enters the wind power installation and leaves it again in addition it is also possible to envisage providing that the fuel cells or pumps with which a certain portion of the wind power installation is flooded with nitrogen are switched on with a time delay so that even after a person is by mistake locked inside the wind power installation there is still a certain period of time available to notice the mistake and to free the person from the installation in good time finally the access to the installation from the interior can be provided with an emergency opening device which makes it possible to leave the installation even without a key supplying the interior of the wind power installation with an inert atmosphere such as a nitrogen gas is not just limited to the pod or to the interior of the pylon as the pod is also directly connected to the rotor and thus the rotor blades of the wind power installation the rotor blades can also be supplied in the interior with a suitable nitrogen atmosphere in order also to prevent a fire from breaking out in.