A campaign group has cast further doubt on the idea of a 'Boris Bridge' or 'Burrow' connecting Northern Ireland to Scotland.
The UK and Ireland Nuclear Free Local Authorities (NFLA) said it would be a "real challenge" to develop either project, particularly if built in an area of the Irish Sea called Beaufort's Dyke, where tonnes of surplus munitions from two world wars and radioactive waste are dumped.
A 21-mile bridge from here to Scotland was proposed by Boris Johnson in 2018, with a price tag of around £20bn - and was widely derided at the time.
But with the UK leaving the European Union in January, discussions on how to keep the union together have gathered pace.