Transport boats can do very simple, short waterway through the Arctic Ocean. In short, if, before our time submarines were only war, but now on nuclear submarine fuel, or nuclear submarines, making it appropriate peaceful exploration of underwater roads.
Most people on the ground believes that the time will come when the military armor and equipment of shells and torpedoes, the battleship and submarine military people will learn from the books and see their model in historical museums.

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Therefore, in our time we can build not only a model of current and historical military submarines, but must submit a model submarines for peaceful purposes. True, the shape of a submarine for peaceful purposes can not be very different from modern forms of the submarine, as it is determined by the features of diving and a desire to ensure the best boat seaworthiness.

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Basic seaworthiness
Submarines must navigate on the surface, dive, swim underwater, surface, should have the ability to maneuver and have enough speed, finally, they must be stability. These basic seaworthiness depends on the design of the boat.
The boat, like every body is attracted to Earth with the force G, which is called the weight of the boat. Weight of G is directed vertically downward and is attached to the center of gravity of the boat. If the boat drop into the water, then under the weight of it will seek to withdraw to the bottom.
On each square centimeter of submerged surface acts specific force (pressure), perpendicular to the surface. The pressure will be greater, the deeper the water is surface. All unit forces directed horizontally to form a lateral compression force housing. Resultant of all the specific forces acting on a submerged surface of the body from the bottom up, is the Archimedes buoyancy force, or force to maintain.
Force to maintain D directed upward and affixed to the center of the body size.
Center of buoyancy is called center of gravity of the displaced body of water.