Not sure but it looks cool... Either a shelter or some sort of common area.

Let’s play a game! Let’s pretend you rented a giant yacht for the weekend somewhere warm. It’s one of those amazing boats that has a bedroom underneath and a fully stocked kitchen. So, you take your boat out into the sea for a sunset cruise and are drinking wine and beer and having a great time....

This is our shelter from our four day survival trip on a deserted tropical island off the coast between Malaysia and Thailand. We went here with nothing but a knife, a flint and a machete.

Three sailors are rescued from an uninhabited Pacific island by the US Navy after spelling out "help" with palm fronds.

One man’s wild quest to make the deserted island fantasy the ultimate reality.