Regular readers of this blog will know Mayor Ken Livingstone issued a �100,000 reward for anyone who could invent a workable solution for air conditioning on the London Underground. The tube's always has a problem of how to cool narrow tunnels - some built well over a hundred years ago and many 60 metres under London's streets. Apparently over 3,000 people from around the world sent in ideas on cooling down the tube in the recent heatwave we had. An idea from Israel which is currently getting a lot of publicity involves giant snow machines above ground. A similar idea was used to cool down gold mines in South Africa:
"The snow made at street-level would be pumped through pipes into containers placed in train tunnels or at platform entrances.
Then as trains pass through it would create air currents causing cold air from the containers to circulate and cool passengers in stations. " said the BBC
Sounds a bit barking mad to me, and I'd quite like to know "the science bit" behind it.
A spokesman for London Underground said: "We cannot comment on specific ideas as this would prejudice them and subsequent entries."
But keep those mad ideas coming in as there's no deadline yet for submitting "cool" ideas.