It would seem that after Robert Fulton managed to create an almost working submarine, the diving business had to go forward with good speed. However, the main engine of progress in this area was the war, and after the bloodiest of the Napoleonic era in Europe and America came a lull. Of the immediate followers of Fulton can be mentioned is that the brothers Kössen, who had just “to the table” and built in 1810 in Le Havre an obvious rip-off of the first “Nautilus”. (Actually, the brothers did not hide a “source of inspiration”, even naming his creation “the Submarine Nautilus”).
Fundamentally new in their boat had almost nothing: the same wooden hull length 8,23 m, sail for movement on the surface sabaliauskas on the mast arms for the type busalacchi “Turtle” – box of gunpowder, attached to the enemy ship using the gimlet. But some inventors-“plagiarists” still trying to improve. One of the innovations nearly ruined the boat we are talking about the flexible hoses for the exchange of oxygen-depleted air (and a crew of 9 people “drinking” it in less than an hour) fresh sea. These hoses from the skin was attached to the surface of the water to the floats. It is clear that the whole structure as a whole and each part of it was a source of possible water penetration inside the case. Indeed, in one of the test “heats” the new “Nautilus” went down after the hose gushing water. The team managed to plug the ducts from the inside, to pump water from the ballast tanks and surface. No wonder subsequently that the invention in the underwater shipbuilding did not catch on until much more reliable snorkel after a century or more. But another has proved surprisingly useful: two pairs of horizontal rudders allows you to change the depth of immersion on the move even at very low underwater speed, due to the same use as the engine of human muscle power. Since the horizontal rudders to dive become an integral mechanism for submarines. The very same “submarine Nautilus” as a whole is not a step forward, and therefore was not used and, of course, repeated.