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The first-ever archaeological excavations at the Nazi death camp Treblinka have revealed new mass graves, as well as the first physical evidence that this camp held gas chambers, where thousands of Jews died.

Presented in a new documentary, "Treblinka: Hitler's Killing Machine," which will air Saturday (March 29) on the Smithsonian Channel, the excavations reveal that the Nazis weren't as adept at covering up their crimes as they believed when they razed the death camp in 1943. Brick walls and foundations from the gas chambers remain, as do massive amounts of human bone, including fragments now eroding out on the forested ground surface.

"For me, that was quite shocking," said project leader Caroline Sturdy Colls, a forensic archaeologist who normally works with police to find modern murder victims. "These artifacts are there, and these human remains are on the surface, and they're not being recorded or recovered."