Strange Shapes from the underground

We live on earth, and we climb the ground every day, we don't know everything, what is contained in the soil, and what happens there.

We as humans must know the word / term "excavation", excavation is one of the ways that humans do to find something that is in the ground.

Among the many excavation needs, including for oil and gas mining, for archeological needs, even for the need to establish new building foundations.

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What is this object, exactly?

Like an object I discovered, some time ago, when we did mutual cooperation with college and high school students in a place to clean up objects of historical value.

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I looked at it more closely, and found the white form in the ground crust, it was like a rock, which was inhabited by a kind of insect, but I did not have time to find the insect, and did not know the type.

If you look in more detail, the shape of this deliberate pattern will amaze you, because it is in the ground, a depth of 1.5 meters. Mysterious insects can survive and breathe.

Maybe some of my friends know what this item is, please comment.

@steemvest17 from esteem surfer app | Oct 17 2018