How did you diagnose? CCTV?
9" angle grinder, lump hammer & bolster, and various digging things.
It wouldn't have been possible to get any cameras into the drain, as it was all ceramic & cemented in place (including the grill / cover).
I'd still have dug it up in any case - It's the only way you'll get to really see what is going on.
Sounds... fun. I can see this escalating quickly.
Even more fun was finding that I was also cutting into a mystery metal pipe buried under the drainage pipe.
No idea what is in it - luckily I only scored it before I saw it.
@atk started
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9" angle grinder, lump hammer & bolster, and various digging things.
It wouldn't have been possible to get any cameras into the drain, as it was all ceramic & cemented in place (including the grill / cover).
I'd still have dug it up in any case - It's the only way you'll get to really see what is going on.