Underwater structures near Yonaguni
Links:
https://archivapp.sagenhaftezeiten.com/de/profiles/ae8c0f8191ae/editions/4d05ddd72a45adf62af3/pages/page/14
https://archivapp.sagenhaftezeiten.com/de/profiles/ae8c0f8191ae/editions/b5ba04309970e07039d9/pages/page/5
https://www.youtube.com/watch?v=jYBJnX9AHOg