Herzog completed a documentary called Cave of Forgotten Dreams in 2010, which shows his journey into the Chauvet Cave in France. Although generally skeptical of 3D film as a format, Herzog premiered the film at the 2010 Toronto International Film Festival in 3-D and had its European premiere at the 2011 Berlinale. Also in 2010, Herzog co-directed with Dimitry Vasuykov Happy People: A Year in the Taiga, which portrays the life of fur trappers from the Siberian part of the Taiga, and had its premiere at the 2010 Telluride Film Festival.
