The Marine Corps is investigating the death of an Okinawa-based sailor, who was killed Monday at a popular tourist destination on the island.

The sailor’s identity has not yet been released, but officials say he was assigned to 3rd Medical Battalion, 3rd Marine Logistics Group, III Marine Expeditionary Force, out of Camp Foster, Okinawa.

The cause is still unclear, but it appears the sailor died in a diving accident at a popular snorkeling spot at Mermaid’s Grotto near Cape Manzamo. The scenic rock formation is one of the most popular places among both Japanese and visitors of the island.

According to the Naval Safety Center, this is the 11th time in the last year that a sailor has died while engaged in off-duty or recreational activities.

This is the second death to happen on the water in the last year, military.com reported.

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