How to open up T-shape clogged drain pipe?

[Ting Liu]

I have a two-unit apartments. The two apartments are side by side. Their kitchens are next to each other separated by a wall. The two kitchen sinks are connected by a T-shape drain pipe.  The T-shape drain pipe is clogged. I tried to unclog it with a 30-foot snake.  But the snake went from one apartment to the other apartment, but unable to get into the bottom part of the T-shape. I think the top of T-shape is flat. If it is a Y-shape, snake should be able to get into the bottom pipe.  I have also poured a large bottle of Drano into the pipe.  But no luck.  Besides opening the wall, is there any other way to solve the problem? BTW, the pipes are all buried in concrete wall. If I have to open the wall, is there a good way to do so. Please advise. Thank you!

[Joe Splitrock]

@Ting Liu hire Roto Rooter to come in and fix it. They have better tools and skills than you do. They can use a bladder to plug the other side as Wayne mentioned. Whether it is Roto Rooter or someone else, get a company that only does drain clean out. A standard plumber may suggest tearing the wall open because they don't specialize in auger techniques. Roto Rooter may also put a camera in there to get a better idea what they are facing. 

Keep in mind depending on age of the property, this could be rusted closed steel pipes. That type of issue may keep recurring and you may be forced to cut open walls to replace. 

I would not start cutting open walls without someone putting a camera in the line to see what is going on. I assume there is no way to come up from the bottom on the clog? Even if you had to cut a section of pipe out, that is easy to repair if you have access. That seem obvious so I assume it is buried or encased in cement below too.