This article links to a US military website with more info . It seems like it took place in Mermaid's Grotto in Okinawa
Takahashi's body was found two days later about 1,000 feet offshore in Awa, Nago city, a Japan Coast Guard spokesman told Stars and Stripes by phone Oct. 4. His rental car was later found at Mermaid's Grotto, the spokesman said.
ugh this article doesn't manage to answer the five Ws
you have to assume that they included a photo of mermaid's grotto okinawa because that's where it happened
This article links to a US military website with more info . It seems like it took place in Mermaid's Grotto in Okinawa