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The soaring temperatures on the London Tube over the summer months have been a problem for some years now. A London Underground group has attempted to come up with some engineering options to the problem by developing a groundwater cooling program. The trial, which begins this summer, aims to make it cooler for passengers on platforms and will be tested at Victoria station which is so deep that it is properly below water and pumps out 35 litres (eight gallons) a second, to cease it coming by means of the walls. The idea of the new method is to push the water via a network of pipes into heat exchange units on the platforms, which will suck in warm air and pump out cooler air. The heat could be used to energy properties and offices above and this way the temperature will be brought down. But this is only a trial to be tested this year and it is far from being place into work as nicely as new trains with air cooling systems that are promised for Circle, District, Hammersmith and City and Metropolitan lines. official link Meanwhile the temperatures in the deepest tunnels, reach 30C (86F) in summer season. These changes could affect the London Tube in a drastic way. Some of the Tube lines may be closed specially on the hot summer time days. London Underground assures that there are no plans to close any Tube Lines in the course of the summer season but in the future years it could get to the point "where the underground will turn into literally intolerable and you could face the prospect of loss of life" as Mr Livingstone from LU advised. About 1,000 London Tube passengers had been trapped for almost two hours when three trains had been held up in a tunnel. The Central Line closed immediately after signal failures stopped the trains among Marble Arch and Lancaster Gate. The trains have been evacuated and 3 people were treated for the effects of heat. official link