#1 I don't have a video of this , it was back before phones could take pics much less record video.
#2 when I described it to my new companies Safety guy he told me if we did that there he would 'fucking kill me'
Take a piece of emt/pvc and bend a slight bend in it, tape it with duct tape to the hose on an air compressor with a lot of rags for space.
Put the new thing in an electrical conduit that was too full of water or too far away to get a string in it. , put the string in the bend, and put a bag on the string (Not a 'rat' for you electricians) a bag like at the grocery store worked way best.
Put this conglomeration into the conduit and blow it thorough. They did make rigs like this with co2, but I'm talking about one with a 125 air compressor. The bend is to get the string in the pipe and to give the pressure somewhere to go if it's blocked.
But oh boy if it's not you get a fucking hurricane of water at the end, along with your string and that bag. I'm explaining it wrong but it 100% worked. This was in Myrtle Beach where every conduit in the ground was full of water.