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Project 626 Transport Submarine

In 1952, began developing "podledno-transport" [under-ice transport] submarine Project 626 for troops in Arctic areas, as well as for air surveillance and communications while in the Arctic basin. It was supposed to put up to 5 tanks and fuel for them, or 165 people landing with weapons or ammunition and food supplies.

The submarine would pop up almost in any given area. It was equipped with sonar equipment, usage with sufficient accuracy to navigate underwater, and was assisted heater system for education in a piece of ice through holes for paratroopers to the surface through vydvižnuû shaft. Designers have proposed several options. The closest to the job acknowledgement, where normal displacement boat was 3480 tons, length was 100 m, width-9.5 m, draft: 6.6 m. Speed on the surface was 12 knots, underwaterspeed was 8 knots. For a power plant the above-water propulsion was two 37[D] production engines with a power of 2000 hp each, and after the dive it was intended to use the combined diesel-electric installation.

Unlike Project 621 this boat had two 533 mm torpedo and 4 torpedoes. Artillery armament consisted of two mated P-25 anti-aircraft guns . The submarine hull was designed with eleven compartments. The nose and middle parts of the hull section had a form of a figure-eight that passed to the stern into a circle. In the upper part of the figure-eight were located the cargo holds, which concluded with the sealed hatchway for the output of tanks into the permeable camera, which had platform with the hydraulic elevator for supplying the loads upward.

In the lower part of figure-eight were storage batteries. In the cylindrical part of the hull they were arranged central station, it cut off auxiliary mechanisms and power plant. The electrical heaters, which were being placed in the region of felling, possessed the power, sufficient for the breaking the ice floe of four-meter thickness. The opening served for the installation of sliding shaft mounting, and also for the supply of air with the work of engines for charging the storage battery. In the extremities of boat were found buck stays, by which abutted against the underwater surface of ice. In the superstructure aft of the cockpit a self-propelled mobile pontoon was fastened.

The presented version caused numerous critical observations. Therefore in November 1955, the came the curtailment of further development of the Project 626 design.