What Leonardo da Vinci invention was a breathing apparatus for divers?

Leonardo da Vinci’s diving suit was a breathing apparatus designed for underwater exploration.

Leonardo described the apparatus in the Codex Atlanticus in the early 16th century. His concept included a mask, breathing tubes, and a system intended to keep the diver supplied with air while submerged. Some versions are associated with a supporting float or air chamber at the surface.

The design is frequently linked to military operations in Venice, where divers might have attacked enemy ships underwater. However, historians cannot prove that Leonardo’s suit was built or used in warfare. The drawings are better understood as experimental engineering proposals than as documented military equipment.

Leonardo’s idea also differs from modern scuba equipment. Long tubes would have made breathing difficult at depth because water pressure increases and the diver must overcome resistance in the air passages. Modern divers use compressed-gas cylinders and regulators. Even so, Leonardo correctly recognized that underwater work required a dedicated breathing system rather than simply holding one’s breath.