Clever culvert cleaning method

Can you make a video on how Randal got the rope through the culvert so he could do this?Anyone else wondering how they passed the chain through the pipe in the first place ?As a stormwater engineer, this is one of the most satisfying things I've ever seen.A couple years back, he called a company and when he got the bill he said F that. He planned ahead and left the rope there when they were done. He repeats the process when he needs to and monitor the rope for deterioration. It's a wild guess buy I'm assuming I'm correct
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