The first major archaeological dig to take place at a medieval castle near Swansea is underway. Experts and volunteers are hoping to uncover artefacts along with clues as the original layout of Oystermouth Castle in Mumbles. They will be on site digging and examining trenches for three weeks. The ruined castle was recently given a £1.7m restoration lifeline which will pay for conservation works and for a new interpretation centre. The dig is focusing on an area outside the west tower where archaeologists are looking for an outer wall and a ditch. They are also examining the knoll after a geophysical survey commissioned by the friends of the castle suggested underneath the ground were walls. [...]