Coffin
(2011)

Neither  Sean Justice (Kevin Sorbo) or his lover Rona Samms (Sunny Doench) have been actually kidnapped and burred alive on the beach by Trick (Johnny Alonso). It's a scam to trick cash out of her husband Jack (Patrick Barnitt) in a form of extreme acting performance.

Sometime later, Jack shows up by they're resort poolside sporting Trick's shades, he hands them a mobile and informs he's going to put them through the same experiences they did to him, only now it's for real and they have to play or someone will die and they will be blamed. As he says that, Trick comes to, only to discover he's been buried alive with only a torch and a mobile.

Thanks Nicholas!

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