Chapter 143 Soaring to the Skies_1

"Is that the same stone door that won't open?" Yang Yi asked.

However, Tang Shihao shook his head and explained, "This time, we dug around the sides and exposed the entire outline of the stone door! But there's nothing behind it!"

"Nothing behind it?" Hearing this, Yang Yi thought to himself, "Could there be a space-time wormhole?"

After half an hour more, Yang Yi stood before the massive stone door, which loomed large and stood erect in the mountain body, but there was nothing like a cave to be found in front or behind the door.

It was as if it were a tombstone, a towering one. Yang Yi furrowed his brows; he remembered clearly that behind this stone door was an underground city, but now there was only this door.

Tang Shihao, also puzzled, walked up to the edge of the stone door and looked around, examining the front and back, as he expressed his confusion, "We witnessed it opening with our own eyes back then, so how can there be nothing behind it now?"