The submarine was envisioned by Leonardo da Vinci and first built in the 1600s.
✓ TRUE FACT
Leonardo sketched concepts, but practical early submarines are associated with experiments in the early 1600s (notably Cornelis Drebbel’s demonstrations in the 1620s). Later designs improved with better hulls, propulsion, and life-support, enabling underwater travel for hours rather than minutes.
🤯 "The submarine was envisioned by Leonardo da Vinci and first built in the 1600s. Underwater travel, centuries before Instagram scuba pics."