I have started addressing a long-clogged kitchen sink drain that has led me below the floor to the crawlspace and to a cast iron drain pipe that was cracked part way down. I noticed it was filled with a hard brownish material that was impenetrable by auger so I decided to cut off the cracked section, which was about 6-8 inches of pipe. Even below that, right before the elbow, the pipe is filled with a very hard grayish-brown, seemingly metallic substance. I tried drilling the center but even that was difficult. Does anybody have any experience here or know what I am looking at? Thanks, Steve
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