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Marine biologist Monty Halls is on a mystery to solve some of the greatest mysteries in the world of diving. In this episode, Monty visits the most dangerous dive site on Earth, The Blue Hole on Egypt's Red Sea coast to try and discover why it has taken the lives of so many divers.

Under the surface of every body of water on earth there lurks a mystery or blood curdling legend – a tale of lost treasure, deadly curse, ghost ship or ancient civilisation. In this series Monty Halls goes in search of the real story behind the worlds greatest underwater mysteries, pushing the safety limits on truly dangerous dives backed up by cutting edge camera technology. Advances in technical diving and multi-scan mapping tools mean that these sites can be revealed as never before, all Monty needs to do is launch the expedition for the exploration to begin. This is true Indiana Jones diving wrapped around gripping detective stories set against the backdrop of some of the most beautiful and mysterious locations on earth.



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