Internal documents obtained by The Ferret from the Scottish Government’s environmental watchdog disclose that radioactive water drained into the loch, which is popular with swimmers, divers, kayakers and fishers, after a major flood in 2019.

According to the Scottish Environment Protection Agency (Sepa), the pollution happened because the Royal Navy failed to properly maintain a network of 1,500 pipes at the Royal Naval Armaments Depot at Coulport on Loch Long in Argyll.

The Guardian UK coverage.