Captain Haddock oeuvre", it is inspired by the German French-language film "Captain Craddock". In "The Crab with the Golden Claws", Haddock sings one of the film songs, "Les gars de la Marine". At the time of Captain Haddock's introduction to the series in 1940, the character's manners presented a problem to Hergé. As a sailor, Haddock would need to have a very colourful vocabulary, but Hergé could not use any swear words as he knew his audience included children. The solution reportedly came when Hergé recalled how around 1933, shortly after the Four-Power Pact had come into being, he had overheard a
SS Belgian Captain convoys during the Second World War. Convoy ON 177 departed Cardiff on 4 April 1943 bound for New York. "Belgian Captain" was carrying a cargo of coal bound for Halifax, Nova Scotia. Convoy HX 241 departed New York on 25 May 1943 and arrived at Liverpool on 10 June. "Belgian Captain" was carrying a cargo of steel and lumber bound for London. She sailed from Halifax on 27 May and joined the convoy at sea on 29 May. Convoy ON 192 departed Milford Haven, Pembrokeshire on 8 July 1943 bound for New York. "Belgian Captain" was bound for Halifax, Nova