I had never heard of his scuba gear designs. From the source page: "Da Vinci's fascination with the sea spurred many designs for aquatic exploration. His diving suit was made of leather, connected to a snorkel made of cane and a bell that floated at the surface. Proving the artist was also practical, the suit included a pouch the diver could urinate in."

The first man who technically thought about flying and created his designs and the man who created water ducts to supply water and drainage system.

Vinci was a genius and most of his ideas works very well.

Amazing man. You surely must have to have some serious contemplation time to come up with ideas like these. Seems like I hardly have time to think!

Brilliant!

He designed the first helicopter too.