Patio area for a new build - What is this?

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Hello,

Sorry if this post is in the wrong place, I have recently moved in to a new build house and taken up slowly doing the landscaping in the back garden. I am going to put pavers down in a 4.5m x 5m area, but whilst digging out the area I have come across this in the attached picture.

It is basically right in the middle of the area that I want to pave, I believe that it is related to the drainage in some way? Would I be able to pave over the top of this or is it something that needs to be left uncovered?

I have had no response from my builder about this, so hoping someone here can shed some light.

Thanks