Leonardo da Vinci’s diving suit was a wearable underwater outfit with a breathing tube connected to the surface. Leonardo designed it for divers who might approach enemy ships underwater, making it both an engineering study and a proposed military device.
The design is generally associated with the early sixteenth century and appears in Leonardo’s notebooks. It included a full suit, a mask, and tubes leading upward to a floating structure. Some reconstructions also include a bag or container intended to collect urine, reflecting Leonardo’s attention to the practical problems of remaining underwater.
Leonardo’s concept was not a self-contained scuba system. The diver depended on air supplied from above, and the proposed materials and seals would have created serious technical difficulties. The design also lacked the pressure-control equipment and compact compressed-air cylinders used by modern divers.
The suit is often confused with a submarine, but it was equipment for an individual swimmer rather than a vessel. Its importance lies in recognizing that Leonardo applied observation and mechanical planning to underwater movement long before modern diving technology existed.