Structurally Sound
The police officers chipped away at the concrete that surrounded the hole and it gave way with ease. The concrete was fresh, barely a few hours old based on their observations. After shining their lights into the hole, the officers could see that the tunnel was paved with concrete and dozens of 2x4 boards bolstered the sides of the tunnel to keep it from collapsing. Whoever made this tunnel must have spent years constructing it, and had taken extreme care to make sure that it would not collapse inward.
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