A report highlighting the dangers of underwater explosions and radioactive waste has cast doubt on the viability of any Irish Sea bridge.
The UK and Ireland Nuclear Free Local Authorities (NFLA) study focused on Beaufort's Dyke, one of the deepest sections of water in Europe and a training site for nuclear submarines.
Munitions from both world wars and radioactive waste, when it was permitted in Europe, are known to have been dumped in the stretch of sea.
The NFLA's report highlighted British Geological Survey work showing that explosions caused by degrading munitions were a "relatively frequent occurrence".
At least one of these explosions is known to have generated a force equivalent to approximately 5.5 tonnes of TNT.
Such problems could scupper plans for a £20billion, 21-mile bridge between Northern Ireland and Scotland, which was suggested by Boris Johnson last year amid much fanfare.
There has been recent speculation, however, that the Tory leader may have since abandoned the plan in favour of a undersea rail tunnel between Larne and Stranraer.
The report was drawn up by the independent marine radioactivity consultant Tim Deere-Jones at the request of the NFLA All Ireland Sustainable Energy Forum and the NFLA Scotland Forum.
Although it is not connected to the bridge scheme, its findings appear to dampen the prospects of the project being green-lit.
It follows a recent report of a near-miss incident between a Belfast-Cairnryan passenger ferry and a Royal Navy nuclear-powered submarine.
Beaufort's Dyke is located close to the Royal Navy base at Faslane, where Trident nuclear submarines are stationed.
The near-miss was detailed in a report by the Marine Accident Investigation Bureau.
The area is noted for being a busy chokepoint in the Irish Sea, with passenger ferries, oil and gas tankers and many commercial fishing trawlers travelling across it regularly.
Mr Deere-Jones said it was evident from the available evidence that Beaufort's Dyke had been "extensively utilised" for the dumping of surplus military munitions, comprising small arms, artillery and chemical weaponry from the First and Second World War.
The NFLA is to contact the Scottish and Northern Irish devolved governments, and central government in Westminster, for further information about the health and safety issues arising from its report.
SDLP councillor Karen McKevitt, the NFLA All Ireland Sustainable Energy Forum co-chair, welcomed the findings, saying they provided a greater understanding of the "ongoing risks and environmental concerns" around Beaufort's Dyke.
"The report is most helpful in showing how difficult it has been to get the true facts on the amount of dangerous materials dumped into this part of the Irish Sea," she added.
"Given the considerable number of near-miss incidents involving nuclear-powered submarines and commercial fishing and even passenger vessels, I would encourage the British-Irish Council to review both the safety of this area of deep water and (look at how it can) ensure a reduction in such incidents."
Robin Rickard, a consultant with explosive ordnance advisers Exord, told the Guardian newspaper in February that "any intrusive works, such as piling associated with the construction of bridges, would pose an unacceptable level of risk" because it could disturb dumped munitions on the seabed.