As a preview to the Iran dawn hanging, here is his pre-execution interview. (Doesn't show the hanging – that was in the earlier video – but shows the frightened guy sobbing on camera as he talks about being executed).
Last moments of two terrified men, sobbing as they are interviewed in a prison car immediately before being led to the gallows. Then you see them being led to the gallows, then the moment of hanging. Shame the video stops after that: wanted to see them kicking. But at least you see the ropes tighten. https://www.liveleak.com/view?i=7b8_1486795616
21 hangings... must have taken all day if you allow 20-30 minutes for each one. They all had to wait in the corridor for the previous hanging to be carried out. Imagine being next in the queue, and waiting for up to 30 minutes (using Kuwait hangings as a guide – they're frequently reported as taking 20+ mins for death to occur after the drop) knowing that that is how long you will hang from the noose. Probably you can hear the noises of the hangings in the next room.