Cornish diver's fears over Swansea lagoon's quarry impact
Plans to extract rock to build a £1bn tidal lagoon in Swansea Bay have caused controversy - because of their potential impact on a marine conservation area in Cornwall.
A decision is expected soon on whether the UK government supports the tidal energy project.
But there has been opposition to planned jetties and a breakwater wall needed to allow rock to be shipped from St Keverne in Cornwall to south Wales.
Mike Anselmi, who runs Porthkerris Divers, said it would impact his family business as well as marine life.
He told BBC Wales environment correspondent Iolo ap Dafydd he believed the quarry would present the first challenge to the conservation zone since it was set up in 2013.
The lagoon developer said no decisions had yet been taken about rock supply.
28 May 2015