This spectacular, surprising series combines stunning photography and fascinating insights with all the energy and excitement of a good thriller. From the striking but gentle turquoise seas of the Caribbean to the icy-cold Arctic, our oceans hold secrets and stories, the likes of which we have barely even begun to know.

A team of intrepid adventurers – explorer and expedition leader Paul Rose, maritime archaeologist Dr Lucy Blue, marine biologist Tooni Mahto and conservationist Philippe Cousteau Jr., grandson of Jacques Cousteau – undertake a journey to discover the world beneath the waves. Using the latest in scuba and submersible technology, the Ocean team of experts delve deeper than ever before.

Each episode sees them exploring a new sea or ocean, diving every day they can to explore the unknown depths, facing personal challenges and genuine jeopardy.