By analysing their data jointly, the Planck and BICEP2/Keck collaborations have shown that the detection of primordial gravitational waves through the observation of the polarisation of the Cosmic Microwave Background (CMB) has not occurred yet. This result constitutes the denouement of the scientific drama that kept enthralled cosmologists and universe enthusiasts alike since March 2014: the signal, the detection of which has been reported by the BICEP2 team, is not related to the first instants of the Big Bang. It results from the combination of the Galactic signal and of gravitational distortions of the CMB during its propagation down to us.