The shortest distance between the two is just 12 miles. Both the Treasury and Department for Transport have been asked for advice for the costs and risks of the project which the DUP believes could break the Brexit impasse and remove the need for a border in the Irish Sea. Channel 4 news have seen the documents that reveal Mr Johnson wants to know “where this money could come from” and risks which include “WW2 munitions in the Irish Sea”.
The Department for Transport produced a “factual paper on the subject” after previous discussions between the DUP and former Transport Secretary Chris Grayling, since replaced by former Tory Chairman Grant Shapps.
The DUP hold 10 of the 18 Northern Ireland seats in the House of Commons and 27 of the 90 seats in the currently suspended Northern Ireland Assembly.
Sinn Fein also have 27, but the unionist block including the DUP, 10 UUP members, 2 independent unionist and one member from Traditional Unionist Voice outnumber the Nationalist parts at 40-39.
A Government spokesman said: “Government regularly commissions work to examine the feasibility of projects.
“During the leadership campaign candidates spoke about a number of issues which resulted in Number 10 commissions ahead of a new Prime Minister taking over.
“This PM has made no secret of his support for infrastructure projects that increase connectivity for people and particularly those that strengthen the Union.”
Mr Johnson suggested the bridge while he was Foreign Secretary.
Professor Alan Dunlop had around this time suggested a road and rail link between Portpatrick in Dumfries and Galloway and Larne in County Antrim.
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“Those who currently cross between Northern Ireland and Scotland by ferry can testify to the need for improved road connections.
“Given that munitions already wash up on beaches on both sides of the North Channel there is also a need for a proper survey of exactly what has been dumped between Northern Ireland and Scotland, and assessment of any risk these pose, regardless of whether any construction project will be taking place.”
Mr Girvan ended his peace by declaring: “There are many ambitious projects that we can look back on today and admire the foresight of those who saw a vision become reality.
“None of them would have happened if the initial proposals were rejected without even receiving proper consideration.
“As we leave the European Union, the DUP has been clear that there should be no border erected down the Irish Sea.”
He concluded: “Instead of placing barriers between parts of the United Kingdom we should be building bridges.”
The longest bridge in the world is the 102.4 mile long Danyang-Kunshan Grand Bridge which straddles the Beijing-Shanghai High-Speed Railway.
Lake Pontchartarian Causeway is a fixed link of two bridges crossing Lake Pontchartrain in southern Louisiana.
The longer of the pair is 23.83 miles making it the largest bridge over water in the world.