ISTANBUL-Rail passengers using Turkey’s new tunnel under the Bosphorus had to walk part of their journey Wednesday when an electricity failure briefly halted services, just a day after its grand opening.

The 13.6-kilometre undersea tunnel in Istanbul - the world’s first linking two continents - was inaugurated with great fanfare on Tuesday as the government’s ‘project of the century’. But a power cut forced passengers to leave the train and walk on the tracks, the Dogan news agency said, before the problem was fixed and services resumed within a few minutes. The tunnel, the fulfillment of a sultan’s dream of 150 years ago, is part of a three-billion euro transport project in Turkey’s biggest city. Prime Minister Recep Tayyip Erdogan, a former mayor of Istanbul, revived the tunnel plan in 2004.