Undersea ruins around Yonaguni Island

Some consider the structure a stone quarry from ancient times. In that case, the point in question would be: where are the stones that were supposedly quarried here? There are some megaliths lying about on the bottom of the sea at the depth of twenty-seven meters, but these alone would form a rather inadequate number to be the answer to the puzzle.

Some archaeologist says this place used to be a harbor in ancient times. Certainly, some parts of it do remind you of a harbor. But a harbor with stone stairs must be quite inconvenient, if not unusual.

The simplest conclusion is to see it as a naturally formed structure. Then, there would be no need to be puzzled. And yet, anybody who makes a dive and sees the undersea structure would get the impression that it was made by man.

Q: What do I think?
A: I think that although it basically is a natural structure, there is almost no doubt that the hand of man was involved. Over the course of time I have made over a hundred under-water diving expeditions to the structures in order to investigate the site, and the more I look into it, the more I get the impression that it is a man-made structure. Moreover, what seem artificial or man-made are not only the Yonaguni Terrace, but also the entire ocean floor on the south side of the island.

The more plausible question, therefore, would be about who made the structure and why it was built. It is understandable to consider it an ancient stone quarry, but where are those quarried stones? What did the people build with those stones? The next step now is to answer these questions, and to prove absolutely that human construction was involved in these undersea ruins.