The flight diverted to Nice due to a cargo fire warning.
The first section of the audio clip is taken from the Marseille Control Sector K1 archive. At the end of this section, ATC handed off the aircraft to Nice Approach on 128.2 but this frequency is seemingly not being covered on LiveATC. After a brief silent period, the second section of audio is from the LiveATC Nice Approach archive listed as 124.175. There are no transmissions from the KLM aircraft in this section. Furthermore, there is no related audio available in the Tower feed archive.