Tunnels

2 cards. Each one is a 40-second story with a five-minute read behind it.

1. The horizontal engineering trick that conquered the depths of the earthBefore the steam engine, deep mining faced a lethal enemy: rising water. While vertical shafts were difficult to drain, engineers turned to the adit—a horizontal passage designed …
2. Two teams dug under the sea from opposite shores and missed by only 30 centimetres.Building the Channel Tunnel, British and French crews bored towards each other beneath the seabed. When the service tunnel broke through in 1990, the two halves were misaligned by…

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