Earlier this year some Dutch documentarians got in touch and did some research on the underground music scene in Chengdu. This is the trailer for their film, which is being first shown at Melkweg in Amsterdam on October 21st, 2016. I am looking forward to checking it out!
If you haven't already, check out the Chengdu Underground Vibes documentary which was released just a few months ago: Chengdu Underground Vibes