If the proponents and promoters of the tunnel have never quite succeeded in putting their project across in all the years, they have never quite given up trying, either; and now, in a new strategic era of nuclear rockets, a new era of transport in which air ferries to the Continent carry cars as well as passengers, and a new era of trade, marked by the emergence and successful growth of the European Economic Community, or Common Market, the pro-tunnel forces have been at it again, in what one of the leading pro-tunnelers has called "a last glorious effort to get this thing through." This time they have encountered what they consider to be the most encouraging kind of progress in the entire history of the scheme. In April, 1960, an organization called the Channel Tunnel Study Group announced, in London, a new series of proposals for a Channel tunnel, based on a number of recent elaborate studies on the subject. The proposals called for twin parallel all-electric railway tunnels, either bored or immersed, with trains that would carry passengers and transport, in piggyback fashion, cars, buses, and trucks. The double tunnel, if of the immersed kind, would be 26 miles long between portals. A bored tunnel, as planned, would be 32 miles long and would be by far the longest traffic tunnel of either the underwater or under-mountain variety in the world. The longest continuous subaqueous traffic tunnel in existence is the rail tunnel under the Mersey, connecting Liverpool and Birkenhead, a distance of 2.2 miles; the longest rail tunnel through a mountain is the Simplon Tunnel, 12.3 miles in length. The Channel tunnel would run between the areas of Sangatte and Calais on the French side, and between Ashford and Folkestone on the English side. Trains would travel through it at an average speed of 65 miles an hour, reaching 87 miles an hour in some places, and at rush hours they would be capable of running 4,200 passengers and 1,800 vehicles on flatcars every hour in each direction. While a true vehicular tunnel could also be constructed, the obviously tremendous problems of keeping it safely ventilated at present make this particular project, according to the engineers, prohibitively expensive to build and maintain. The train journey from London to Paris via the proposed tunnel would take four hours and twenty minutes; the passenger trains would pass through the tunnel in about thirty minutes. Passengers would pay 32 shillings, or $4.48–$2.92 cheaper than the cost of a first-class passenger ticket on the Dover-Calais sea-ferry—to ride through the tunnel; the cost of accompanied small cars would be $16.48, a claimed 30 per cent less than a comparable sea-ferry charge. The tunnel would take four to five years to build, and the Study Group estimated that, including the rail terminals at both ends, it would cost approximately $364,000,000.