Deployed in 2022, SWOT satellite was flying over the southwest Pacific region on 19 May 2023 when it recorded the tsunami triggered by a Mw 7.7 earthquake in the Vanuatu Subduction Zone. For the first time ever it provided a 2D image of a tsunami wavefield on a straight SSW-NNE path. Further compared with tsunami numerical simulation outputs, the modelled wavefield and SWOT record show an overall good phase agreement, but simulated amplitudes and energy spectra are lower than the measurements.