The Channel Tunnel
The tunnel,which the French engineer,Aime Thome,planned to build under the English Channel in 1858,would be ventilated by tall chimneys built above sea level.An Englishman,William Lowe,suggested a better plan two years later.Passing trains would solve the problem of ventilation in his proposed double railway-tunnel because they would draw in fresh air behind them.Though work began forty-two years later,it was stopped because the British feared invasion.However,the tunnel was officially opened on March 7,1994.