Plymouth divers research shipwreck database
13 September 2013 Last updated at 13:36 BST
A project has begun in Plymouth Sound to compile a database of all the known shipwrecks.
The water has one of the highest density of shipwrecks in the country.
Hundreds of ships have come to a watery end beneath the waves off the city's coastline, the team behind the Ships Project have said.
The project will also compile a database of the locations of previously unknown shipwrecks.
The scheme will see divers working with museums and history groups, researching archives and recording finds.