The sewer is a long way down, the pipe in the bottom right of the photo shows the sewer connection at the bottom, and the top of the pipe is normal ground level - it was a big hole in our backyard to do this.
You can see the pile of dirt they made doing it! The pipe you just saw is behind that pile.
Here the plumbing is done, and you can see the big concrete drain pit at the far end of the picture - we have 3 of these in our yard.
Finally, you can see our completed yard - everything back to normal shape again, and now you can finally see the top of our water tank (the tank is 2.5 metre high - most of it is underground as only about 30cm is sticking out) sticking out just above ground level there - the deck will ultimately rest on top of that tank.
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