Interesting but what happens if there's a t-section - Video

It's a valid question...

you run a camera down it first

There should not be a tee underground, there could be a wye underground but that pipe should follow the flow line. Hope this helps.

If there‘s a t- saction, you make a c-section

that's a challenging wank

You start at the T-section, or end, you do not get through it unless you want to seal of the rest..

I had this done on a section of the main drain on my house. It was cheaper than tearing up the front porch and front room. It was about $100/foot which is cheaper than the alternative.

I bet a 40/60 dirty thoughts to wtf ratio here

This is the only affordable option. Replacing under foundation pipes requires cuts in foundation. (Assuming concrete/cement foundation)

Reminds of a few videos I've seen online, usually comes out of a human.