This is an unpublished version of the Blake and Mortimer by Jean Dufaux and Antoine Aubin, assisted by Étienne Schréder. It's all Aubin's work that went through the microscope with the reproduction of the penciled boards in their original format. A true invitation to enter the cartoonist's workshop. This dive into Aubin's fantastic pencils reveals, in addition to the text proposals, the different cuts and framings of the edited version, all the precision, the thoroughness, the research and the requirement of the artist's work to slip into the steps of master E. P. Jacobs. An unpublished sketch book completes this superb edition of L'Onde Septimus. An unpublished version of L'Onde Septimus in pencil. The boards reproduced in the original format. The discovery of the workbook of a designer by Blake and Mortimer with 40 pages of additional sketches.