Our poorly kitchen floor

Here is a photograph of our poorly kitchen floor.
We're still not completely sure what is causing foul smelling liquid to come up in strange places all over our kitchen, we had thought it was a broken drain pipe taking sewage out cos the smell is that bad.
But it might just be the pipes installed to take water to the washing machine (you can see where the pipes were laid because of the cement line going across horizontally just at the beginning of where the tiles were taken up)
Anyway, lets hope we get it properly diagnosed soon, and fixed.