BBC News By Aled Scourfield image captionThe plans are part of the Swansea Bay city deal and are expected to create 1,800 jobs Plans to develop a marine energy project could have a "catastrophic" impact on Pembroke Dock's Royal Dockyard, an expert on maritime history has warned. The plans are part of a £60m Swansea Bay City Deal project to develop marine energy in Pembrokeshire. It is hoped Pembroke Dock Marine could create 1,800 full-time jobs in the county. But Dr Ann Coats said she feared the scheme would damage its heritage. It is proposed that historical slipways, a graving dock and timber pond used for shipbuilding could be infilled and covered over. Two new 130ft (40m) high buildings will be built near the waterway.