A MYSTERY 18 METERS UNDERGROUND. What is this built for?

Our tour to Eastern Turkey is full of highlights!
We are still in #mardin and it is noticeable that there are many wine shops, so of course we will have to taste it!
The camper has difficulty pulling up the mountain to old Mardin, so we go to the Fiat garage to check whether there is a problem.
From Mardin we go to #dara where it is only 42 degrees.
Along the way we see a weighbridge, which is interesting to see what exactly our camper weighs.
Then on to #zindan here we discover a huge structure 18 meters underground, and have no idea what this could be.
Then a long way along the Syrian border to arrive at a restaurant where we will eat delicious lahmacun.
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