German Nazi concentration camp during World War II. Located near the village of Treblinka, Pol.
, it opened in 1941 as a forced-labour camp. A larger and ultrasecret second camp a mile away, called T.II, opened in 1942 as an extermination camp for Jews. Victims were stripped and marched into "bathhouses," where they were gassed with carbon monoxide from ceiling pipes. Ukrainian guards and up to 1,500 Jewish prisoner-workers performed the executions. The total number killed has been estimated at 700,000 to 900,000. In 1943 a group of prisoner-workers rose in revolt and escaped, but most were soon killed or recaptured. The T.II camp was closed in October 1943, the labour camp in July 1944.