Good day my fellow TH. I just want to ask your opinion regarding these shells that we found in our dig site. It is under the cliff that has somewhat like a triangle or a one side face of a pyramid. We tried to dig and widen the area since its difficult to enter even a single person. As we positioned in there, we were able to remove a pile of limestone rocks which we think are put in there intentionally. If it is really natural, how come they are piled in there and there is a hole in the inside that we can peep on it so we still need to clear the area thinking there might be an entrance of a tunnel or a hollow area which was covered with these stones.
One of the attached picture are the shells that we found. By the way our dig site is around 30 meters to the sea.