The discovery of this secret passage immediately excited Leonard and the others. At first, they thought they found an interlayer in the rammed earth wall when they saw an unusual spot, but after digging through, they realized it was a hidden passage in the wall.
Especially after the reminder from Joan, the professional, they became even more aware that there must be something hidden in such a strange passage. As a result, they quickly found a metal reaction in the dirt under the passage using a metal detector.
"What is this thing?" After digging with a shovel for a few moments, Fairmont quickly pulled out a rusty iron sheet from the soil and asked with a puzzled look.
The iron sheet looks like a rectangle about half the size of a palm, about two millimeters thick, covered with rust, and in a very poor state of preservation.
