1. Stefan Drzewiecki was a Polish scientist, journalist, engineer, constructor and inventor, known for designing and constructing the world's first electric-powered submarine.

1. Stefan Drzewiecki was a Polish scientist, journalist, engineer, constructor and inventor, known for designing and constructing the world's first electric-powered submarine.
Stefan Drzewiecki worked mainly in France and the Russian Empire.
Stefan Drzewiecki built the first submarine in the world with electric battery-powered propulsion in 1884.
Stefan Drzewiecki independently developed the blade element theory, a mathematical process used to determine the behavior of propellers.
Young Stefan Drzewiecki was sent by him away from partitioned Poland to complete his education in France.
Stefan Drzewiecki graduated in mathematics from the Ecole Centrale Paris and received his engineering diploma.
In 1867, Stefan Drzewiecki made his first invention, a kilometre counter for horse-drawn carriages.
Stefan Drzewiecki personally took part in the war for which he received the Order of St George.
Stefan Drzewiecki developed the theory of gliding flight, developed a method for the manufacture of ship and plane propellers, and presented a general theory for screw-propeller thrust.
Stefan Drzewiecki is known for developing several models of early submarines for the Russian Navy.
In 1902, Stefan Drzewiecki designed the submarine Pocztowyj, which was powered by two combustion engines that operated both underwater and after surfacing.
Stefan Drzewiecki devised a torpedo-launching system for ships and submarines that bears his name, the Drzewiecki drop collar.
Stefan Drzewiecki made an instrument that drew the precise routes of ships onto a nautical chart.
In 1991, a monument commemorating Stefan Drzewiecki was unveiled in the Ukrainian port city of Odesa where the inventor stayed for a period of time and tested his submarine in 1878.
In 2020, Stefan Drzewiecki was featured in a promotional publication titled Polacy swiatu.