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The BOK-1, where "BOK" stands for Byuro Osobyh Konstrukcij meaning "Bureau of Special Designs", also known as "SS" — Stratosfernyj Samolyot meaning "Stratospheric Plane", was a 2-seat, single-engine, low-wing monoplane, designed as an experimental high-altitude aircraft to study the feasibility of performing flights at altitudes above 11,000 metres (36,000 ft). It was the first Soviet plane to implement a pressurized cabin.