On 18 April 2014, while the second unit crew was shooting remaining scenes of the film at Camp II on Everest, an avalanche struck, killing 16 Sherpa guides. The Sherpas were carrying equipment and supplies to camps for climbers in advance of the start of the summer climbing season. Deadline reported there were no injuries or fatalities affecting the film crew. The production was not present where the disaster took place, but they were nearby. Filming at Pinewood Studios in England was just about to finish up, but the second unit was shooting at the camp which then had to halt the production for some time. Hillary Step, camp 4, icefall and the summit were built on the 007 stage at Pinewood Studios with greenscreen for CG backgrounds. Totino said, It was very challenging because we had to re-create the sun, which at Everest is so incredibly sharp and crisp. The team used SoftSun lights for creating sun on the summit, Hillary Step and icefall. They were 9 feet long and 3 ½ feet in diameter and 100,000 watts. They had to be moved around on cranes because they are very heavy, Totino said. To photograph one scene during which expedition guide Rob Hall (Jason Clarke) is stuck on the mountain in the storm, Totino recalled: We tented off a portion of the set with some very heavy plastic and brought in these giant refrigerating units, half the size of a semi truck, and we cooled that part of the stage down to about 26 to 28 degrees Fahrenheit [around -3°C] and brought in real snow. Baltasar really wanted the actor to feel like he was frozen. You really see and feel that. The film was shot with Arri Alexa XT cameras, using the Arriraw format.