en Cuevana 3. At 18,000 feet above sea level and over the course of 40 days last Spring, documentary filmmaker Dianne Whelan immersed herself in the challenging and captivating world of base camp at Mt. Everest. With spectacular footage of the mountains’ landscape as a backdrop, 40 DAYS AT BASE CAMP is an intriguing and intimate portrayal of three climbing teams and their journey to the peak.