BBC NEWS | Wales | South West Wales | Tunnel 'vision' under Irish Sea
A vision of a rail tunnel under the Irish Sea, linking west Wales and Ireland, has been unveiled by a group of engineers.
The Irish Academy of Engineers envisages a 50 mile link under the sea, with a journey time from Dublin to Pembrokeshire of one hour 10 minutes.
A Vision of Transport in Ireland is looking forward to transport in 2050.
High-speed trains travelling at up to 150mph are predicted by the Dublin-based academy.
Academy president Liam Conellan said they hoped to "stimulate debate on a possible framework on travelling in Ireland."
The vision proposed by the public body includes a tunnel link connecting Rosslare to Fishguard in Pembrokeshire across St George's Channel - the route of current ferry crossings.
There would also be improvements linking Shannon on the west coast of Ireland.
"If the vision went ahead it would it would increase mobility in Ireland immensely," said Mr Conellan.
It took 10 years to build the Euro Tunnel linking France and England
"At the moment there are 5.7 million people living in Ireland by 2050 we are expecting there to be 8 million.