This was another super interesting #cassette podcast. Basically there were these tapes that were cut with a saw maybe a few centimeters into the tape. So they were sent to China in the 80s to be scrapped.
But instead, people found these tapes, and repaired them!! (By splicing the tape into a new shell) and then listening to them. It was like thousands of these tapes and it made a kind of underground culture which evaded Chinese censorship at the time. They were called Dakou (cut out) tapes.