Leonardo da Vinci designed an early diving suit for underwater exploration and military operations.
His drawings show a diver wearing a sealed suit connected to the surface by breathing tubes. The design included a mask, flexible connections, and a system intended to let the wearer remain underwater. Leonardo developed the concept while considering naval defense and the possibility of secretly damaging enemy vessels.
The suit remained a proposal rather than a documented working apparatus. Breathing underwater is difficult because air must be supplied at suitable pressure, and a long narrow tube can create serious breathing resistance. Leonardo’s design also lacked the modern regulators and materials that make scuba equipment practical.
The concept is not the same as a diving bell, which encloses a pocket of air in a rigid chamber. It is also not a submarine, which carries its occupants inside a vessel. Leonardo’s invention belongs to the history of early concepts for personal underwater breathing equipment.