Links below feature news on the discovery of a tunnel in Ponar forest, dug by Jews of the Leichenkommando (Corpse Unit/Detail) to escape their captors on the night of 15th April 1944. Although 40 people made their escape through the narrow tunnel, guards were alerted by the disturbance and hunted down the majority of the escapees, with only eleven surviving the war - from a dozen who managed to reach nearby partisans following their escape. As Soviet forces approached, the SS forced around 80 inmates from KZ-Stutthof to perform the arduous task of disposing of the dead that were being burned in numerous pits. One such pit, where the dead had been buried earlier, was used to hold the prisoners and it was there that they made their escape through a 34m long tunnel dug with their hands, improvised tools and spoons. The tunnel took over two months to reach the desired length.
WW2 Jewish escape tunnel uncovered in Lithuania's Ponar forest - BBC News
Tunnel used by Jewish prisoners to escape Nazis found in Lithuania