Rubuta ci gaba don wannan sakin layi - Bayan jinkirta "Sea Lion" a watan Oktoba 1940, "Luftwaffe" ya yanke shawarar a cikin kaka na 1941 don ci gaba da samar da Siebel ferries ban da Sojoji a ƙarƙashin Dokar Ferry ta Musamman ("Fähre-Sonderkommando"). Ya maye gurbin injunan motar dizal a kan ƙirar asali tare da BMW da sauran injunan jirgin sama, gidaje huɗu daga cikinsu a cikin ƙarshen pontoon da aka haɗa da matattarar ruwa ta hanyar akwatin gearbox mai juyawa. Wasu daga cikin wadannan jiragen ruwa an sanya su ga Sojoji kuma suna aiki tare da ma'aikatan da aka haɗu, amma Sojojin ba su son yin amfani da injunan jirgin sama, suna da'awar cewa suna da saurin kamawa da kuma cinye yawan man fetur. Rundunar Injiniya ta Sojoji a Antwerp ta ci gaba da amfani da injunan motar a matsayin babban kayan aiki, kuma sun yi la'akari da su abin dogara idan aka kwatanta da injunan jirgin sama na "Luftwaffe". Goma aka gina don Operation Herkules
, ko da yake an soke shi.