The documentary about the 2010 Western States 100-mile (WSER, 161km) ultramarathon Unbreakable has been made free because of the coronavirus pandemic. The film follows four top ultra runners vying for victory in one of the most prestigious races on the calendar and you can now watch it even if you are stuck at home. WSER is held in summer in Squaw Valley, California. The race is notorious for its range of temperatures, starting at altitude and descending into scorching valleys. The film follows four ultra runners who were all at the top of their game in 2010: Hal Koerner, two time defending Western States champion; Geoff Roes, yet to be defeated at the 100-mile distance at the time; Anton Krupicka, undefeated in every ultramarathon he had ever started; and a young Kilian Jornet, fresh off the back of two Ultra Trail du Mont-Blanc victories. The decision to make the film free follows Jornet making his own Summits of My Life series free for a week . Purchase the China AI Report 2020 brought to you by SCMP Research and enjoy a 20% discount (original price US$400). This 60-page all new intelligence report gives you first-hand insights and analysis into the latest industry developments and intelligence about China AI. Get exclusive access to our webinars for continuous learning, and interact with China AI executives in live Q&A. Offer valid until 31 March 2020.