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An illustration of a cutaway view of an old, disused tube tunnel filled with large yellow sponges, absorbing blue floodwater that flows into pipes below ground.

An illustration of a cutaway view of an old, disused tube tunnel filled with large yellow sponges, absorbing blue floodwater that flows into pipes below ground.
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A cutaway view of an old, unused Tube tunnel. Inside the tunnel: Large yellow sponges lining the floor and walls, soaking up water. Arrows show water flowing into pipes that lead away underground. Label: “Absorbs floodwater below ground.” See more

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