The tunnels under Heathrow’s northern runway lead to the heart of the airport and the centre of a debate over its expansion. When airport managers proposed recladding them in 2011, the projected cost was £24mn. More than a decade later, the work is still not complete and the costs have ballooned to over £300mn.
希思罗机场北跑道下方的隧道通向机场的核心地带，也把人们带到其扩建之争的中心。2011年，机场管理方提议为这些隧道更换外覆材料，预计成本为2400万英镑。十多年过去，工程仍未完工，费用已激增至3亿多英镑。
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