During the dredging of the entrance to Waterford Harbor, archaeologists discovered the remains of what they believe to be a 17th-century English warship.
Lying almost 30 metres down in the middle of Liverpool Bay is the Lelia, a 19th-century paddle steamer.
Off the north coast of Cornwall lies the wreck of a German World War One U-boat, but historical records suggest that the nearest wreck should be over 100 miles away.
The `Wreck Detectives' travel down to Chesil Beach, one of the most dangerous areas for ships, to find out if this was the Hope's wreck site.
The `Wreck Detectives' go to Pembroke dock to find out how the Sunderland sank and determine whether it is one of the most important aircraft wrecks.
The `Wreck Detectives' enlist the help of art historians, cannon experts and geologists to find out more about a fascinating bronze bell.
Beneath the waters of North Wales lies the wreck of the Resurgam: a submarine built during the reign of Queen Victoria and the oldest surviving powered submarine in the world.