In 1966, the Soviet Union had begun work on the creation of midget submarines "Triton". They were led by designers design bureau "Wave". Draft project SMPL "Triton-1M" was developed in 1968. Technical design double midget submarine was completed in December 1969 and 4 April 1970, he was finally approved by a joint decision of the Ministry of the shipbuilding industry and the Soviet Navy. This enabled the team "Wave" begin to develop working drawings and technical documentation for "Triton-1M" in 1970, and in the third quarter of the same year the entire working documentation for SMPL was transferred to the New Admiralty plant, and that same year, the plant began to build the first type SMPL "Triton-1M". The project received the designation 907. In 1972-1973gg. Double unit "Triton-1M" has been tested, and then began its mass production at the Novo-Admiralty Shipyard. There were built 32 units. "Triton-1M" is a unit of "wet" type, two divers with breathing apparatus are filled with water permeable cabin. His body also has a strong impermeable volumes: the control panel in the cab, and the battery electromotive compartments. Power propeller motor - 3.4 kW Full submerged speed of 6 knots, cruising range at this speed of 35 miles. Limiting diving depth of 40 meters, work - 32 meters. Transporter can remain motionless on the ground to 10 days. It is equipped with a magnetic compass, radio, sonar MAR-3, an automatic movement on the course. Delivery midget submarine type "Triton-1M" to the place of operation could be carried out on board surface ships of different tonnage ships and submarines. SMPL Operation type "Triton-1M" was carried out in the domestic fleet by the end of the 1980s, after which they were for the most part written off. Due to the lack of an alternative does not exclude SMPL this type in the battle of the Ukrainian Navy, and the Navy in Azerbaijan and in the Russian Navy.