Our house had a nice cedar pergola in the backyard, about 20'x16', whose posts began to rot at the base. It was covered in grape vine... Nice for shade but not for a falling down pergola. Needless to say, a few months ago we got a pretty good wind storm that finally blew the thing over.

I finally got to dismantling the thing and would you believe it, there's a damn swimming pool underneath it! At least that's our best guess as to what it is.

It's only ~3.5' deep at the deep end and ~2.5' deep at the shallow end... So if it was a swimming pool it wasn't for very large people.

Anyway, we have found ourselves with a huge amount of buried and likely reinforced concrete smack dab in the middle of our back yard. The original plan was to 1) remove pergola 2) plant grass. That's now a lot more complicated.

So the main question is:

How do we remove or mitigate the concrete situation so we ensure the backyard can be enjoyed for a long time.

[![pool1](https://i.stack.imgur.com/Ga1Df.jpg)](https://i.stack.imgur.com/Ga1Df.jpg)
[![pool2](https://i.stack.imgur.com/yNPIn.jpg)](https://i.stack.imgur.com/yNPIn.jpg)
[![pool3](https://i.stack.imgur.com/GS5y9.jpg)](https://i.stack.imgur.com/GS5y9.jpg)