UNWANTED GROUNDWATER could be pumped through London Underground's (LUL) tunnels to cool the subterranean environment, engineers said this week.
The idea, using heat exchangers to extract excess heat, is one of 200 suggestions being considered in a bid to cool the Tube. Air conditioning has been ruled out by space restrictions.
Other plans - submitted by companies, universities and individuals in response to a competition launched in the summer by London mayor Ken Livingstone - include improving air movement within the trains and using Thames river water to cool tunnels and stations.
The best ideas could actually be implemented, said chief mechanical and electrical engineer Ernie Boddington.
'The principles will work, but it's the application and knowledge of the scale that is the problem, ' he said. He added that seasonal temperature differences posed another challenge.
However before the ideas can be taken forward, funding to research the best plans must be found, said Boddington. This could come from the Engineering Council or Transport for London, he added.