In a report dated Riga, Latvia 31 May 1925 No. 4694 were the specifications for the four under the Soviet Navy Program new to be built Russian submarines described. Displacement 850 tons, dimensions 88 x 7 x 7 (draught), speed 16 (surfaced maximum)-10 (submerged maximum) knots, 2x1,40 ap engines, 1,00 hp electric motor, 10 tubes of which 5 submerged 1,100 mm gun and a range of 7,000 nautical miles/9 knots while surfaced and 110 nautical miles/5 knots while submerged. One submarine A.G.30 was already under construction and to be completed by summer 1925. It seemed that the construction of the other three was indefinitely delayed.
Source
National Archive. Record Group 165: Records of the War Department General and Special Staffs Series: Security Classified Correspondence and Reports. File Unit. Russia: Navy - MID 2503-16 THRU 2503-265. Roll 1443.
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