A man named Simon Marks, 37, stumbled upon something incredibly strange. Namely, he has been living in the same house for quite some time, but it wasn’t until recently that he discovered he wasn’t aware of what was hidden in the place he bought some years ago.

Inspecting the damage he had just done and thinking that his day couldn’t get any worse, he knelt down in the driveway and peered underneath his car. But just as he was about to take a closer look at the concrete pavers, he heard the sickening sound that made his heart drop in his chest. What had he found? You can watch video at the end of the article.

Once he removed all the dirt, he noticed a piece of metal underneath. Unaware of what could be hiding under the driveway, Marks gripped the metal piece and tried to pull it out, but to no avail. He then went around in order to learn more of the mysterious object. Not knowing what to do next, he called his father for help and both of them managed to cart away lots of densely-packed mud which eventually led to an opening. There was an old rusty ladder there, and the two men climbed down eager to learn where it would lead them.