Tunnel sind dunkel, manchen Menschen unheimlich. Sie sind im Bau auch furchtbar teuer, verbinden aber Orte auf schnellstem Weg. Wer in Metropolen unterwegs ist, weiß: In Form von U-Bahn-Netzen entzerren sie den Verkehr erheblich. Tunnel könnten zukünftig eine weitere Funktion übernehmen: Als Wärmequelle könnten sie zur Wärmewende beitragen und Gebäude klimaneutral beheizen.
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