Raw TV, the production company behind “The Tinder Swindler,” have set a new true crime documentary with Amazon Prime Video about the 1978 murders of Chris Farmer and Peta Frampton.

Titled “Dead in the Water,” it follows the story of Farmer and Frampton, a young British couple who went missing in 1978 after going backpacking in Central America. Their bodies were eventually discovered 200 metres off the coast of Guatemala tied to engine parts.

They were quietly buried in a sprawling cemetery in the Guatemalan city of Puerto Barrios, with the location of their graves a mystery to their families for four decades — crucially impeding the investigation into their murders — before they were eventually rediscovered. Their killer has never been brought to justice.

“The letters they write and the tapes they sent home were filled with tales of exotic landscapes, cultural encounters, and the thrill of the unknown,” reads the synopsis for the doc.