About 2,500 passengers were trapped overnight in the Channel Tunnel linking France and Britain after four trains broke down due to freezing weather conditions.
Angry travellers arriving in London this morning said they had been left with no power, air conditioning, food or water.
Some complained their journeys from Brussels and Paris, which should take about two hours, had taken up to 15 hours.
Eurostar said the breakdowns occurred when the high-speed trains moved from cold outside temperatures into the warmer tunnel. It has cancelled all its services today because of bad weather.
Temperatures at the tunnel at the French port of Calais were as low as -2 Celsius accompanied by snowfall. In the French capital Paris, temperatures were down to -4C.
The tunnel closure had added to travel problems caused by heavy snow in Kent and police have brought in Operation Stack - which allows lorries to park along sections of the M20 - to ease congestion near the terminal.
Two of the stranded trains were moved from the tunnel and pushed to London St Pancras by diesel locomotives.
Passengers from a third were removed from the train by Eurotunnel shuttle and later transferred to a Eurostar train bound for St Pancras.
Hundreds of people on the fourth train were taken by shuttle to the terminal in France.
The tunnel is 51km long, the longest undersea subway in the world, which conveys about 40,000 people a day between Britain and continental Europe.
