Submarines can be traced back to 15- 16 century Leonardo da Vinci. It is said that he once conceived a "ship that can sail underwater", but this ability has always been considered "evil", so he did not draw a design. Until the eve of World War I, submarines were still regarded as "non-gentleman" weapons, and their captured crew members might be regarded as pirates.

/kloc-in the 0 th and 6 th centuries, real submarines appeared. 1578, the British mathematician William Bourne wrote the book Invention and Design to describe submarines. 1620, the first recorded "diving boat" was built by Cornelius Jabs Dyball, a Dutch-born Englishman, mainly according to the former design, and the propulsion was generated by manually operated paddles.

Da Vinci's introduction

Leonardo da Vinci (Italian: Leonardo da Vinci, meaning "Leonardo of Vinci City"); Julian calendar1April 45215-1May 2, 9), also translated as Leonardo da Vinci, whose full name is Leonardo di ser Piero da Vinci (meaning "Leonardo di Sergio da Vinci, the son of Piero in Da Vinci City", which made him a Renaissance. Asteroid 3000 was named "Leonardo" in memory of Leonardo da Vinci.