Adventurous zoologist Nigel Marven embarks on an underwater expedition through time to explore the seven deadliest seas in Earth's history, coming face to face with strange and dangerous pre... Read allAdventurous zoologist Nigel Marven embarks on an underwater expedition through time to explore the seven deadliest seas in Earth's history, coming face to face with strange and dangerous prehistoric sea monsters.Adventurous zoologist Nigel Marven embarks on an underwater expedition through time to explore the seven deadliest seas in Earth's history, coming face to face with strange and dangerous prehistoric sea monsters.