For the purposes of their investigation, the Smiths have infiltrated the Simoun car repair company. Here they are relegated to the maintenance of vehicles. Very attentive to the words of the director of the company, Dupond forgets the pressure of the tyre he is inflating, and it ends up bursting... Although Hergé only depicted it in part, the Simoun director's car is perfectly identifiable. From the two radiator emblems, the one-piece windscreen and the three sections of the grille, it is a Studebaker Commander Regal De Luxe coupé dating from 1947.