The underwater ruins at Yonaguni's Iseki Point meet the powerful Black Current head on. If they have been there for any length of time, anything light or portable will have washed away. It goes without saying that anything that could be dissolved in water or eaten away by marine life would also be gone. Only stone remains.
A typical feature of the ancient castle/fort/shrine structures known as gusuku in Okinawa is a surrounding wall made of piled up rocks and a stone-paved road. (see the photo from Shuri Castle in Naha) Underwater surveys of Iseki Point show a loop road with a retaining wall made of boulders held in place with smaller rocks.
The loop road and wall are good reasons to believe that Iseki Point was once part of a gusuku complex.
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