Google Earth helped to find a huge ancient fish trap in a estuary. The 260m (853ft) man-made V-shaped structure could be more than 1,000 years old, experts believe. It is believed that the fish trap was designed to catch migratory fish, such as salmon and sea trout going up the River Teifi at Poppit in Pembrokeshire.
The structure is entirely underwater and it has never been surveyed before. Now, research is being undertaken between Pembrokeshire College and the Dyfed Archaeological Trust to find out more about the ancient structure.