Leonardo da Vinci sketched a diving suit as an underwater breathing device for divers exploring beneath the surface.
His design appears in the Codex Atlanticus and included a mask, breathing tubes, and a system intended to connect the diver with air above the water. Some reconstructions associate it with a sealed suit and a breathing arrangement using pipes or containers.
The idea was intended for military or exploratory use, including underwater sabotage. It was not a modern scuba set: Leonardo did not have compressed-air cylinders, regulators, or the materials needed to make the design practical.
This concept is often confused with Leonardo’s sketches for underwater boats and swimming aids. The important distinction is that the diving suit is personal equipment designed to let a person remain underwater while receiving air from above.