Yellow cable
Sure enough, the clues followed him to the source of the light, as a long yellow power cable ran along the bottom of the tunnel. Flint kept his wife informed of everything he found via the walkie-talkie, but that wasn’t really necessary, because she would soon join him and take part in the action.
Yellow cable
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Concrete
In fact, she could hear him through the soil of her backyard. “I think I’m standing right above you!” she shouted loudly into the grass beneath her feet. And then she saw it. A small piece of concrete was sticking out of the lawn right in front of her feet. She had never noticed it before, but now she couldn’t miss it
Concrete
