This stamp from Comoros illustrates the early submarine concept “Nautilus 1800.” The design highlights one of the earliest experimental underwater vessels, featuring hand-drawn engineering diagrams and a side view of the primitive submarine with its distinctive sail-like propulsion system. Such early submarine designs represent the beginnings of underwater navigation and naval engineering. The stamp blends historical illustration with technical sketches, making it attractive to collectors interested in maritime history and technological innovation. Issued in 2008, it reflects Comoros’ tradition of releasing thematic stamps covering science and exploration.