This intriguing 2008 stamp from Comoros (Union des Comores) features the historic Nautilus 1800, one of the earliest experimental submarine concepts designed by American inventor Robert Fulton. The design shows the pioneering underwater vessel along with a schematic illustration highlighting its mechanical structure and sail-like propulsion system. The stamp celebrates early naval engineering and the evolution of submarine technology at the dawn of the 19th century. Its detailed artwork and historical theme make it an attractive piece for collectors interested in maritime innovation and technological milestones. A distinctive modern commemorative issue that connects philately with the history of underwater exploration.