Water and sludge still drip from this huge stone block, which has obviously been dredged from the lake bottom

Water and sludge still drip from this huge stone block, which has obviously been dredged from the lake bottom recently. Upon closer examination, it looks like a huge chest... or rather, a sarcophagus. One side bears an engraved symbol — a skull with a single eye-socket, and the eye-socket is covered with a coin.