In the book “2000 leagues under the sea” I’ve found some information about underwater navigation:

“Here, Professor Aronnax, are the different dimensions of this boat now transporting you. It’s a very long cylinder with conical ends. It noticeably takes the shape of a cigar, a shape already adopted in London for several projects of the same kind. The length of this cylinder from end to end is exactly seventy meters, and its maximum breadth of beam is eight meters. So it isn’t quite built on the ten-to-one ratio of your high-speed steamers; but its lines are sufficiently long, and their tapering gradual enough, so that the displaced water easily slips past and poses no obstacle to the ship’s movements.”

This invention, to my mind, is still not outdated in the 21st century as submarines are very often used for different purposes nowadays.

Ключина Ольга Евгеньевна, ученица 9 Б класса МАОУ СОШ №12 имени маршала Советского Союза К.К. Рокоссовского г. Великие Луки Псковской области 

Учитель английского языка - Тимофеева Марина Алексеевна.