Diver Finds Strange Underwater Building — Then He Learns What It Actually Is

Ben returned the next morning, better prepared. This time, he brought a sonar scanner and markers to map out the dimensions. Over several dives, he pieced together the structure’s outline. It wasn’t huge—roughly the size of a small cottage—but its proportions were unmistakably deliberate. Rectangular base. Internal walls. Stair-like formations inside.