Ask around town residents that you know - ask if any of them remember a vast constuction project.
A bunker either needs a self contained power source ('kin big hole) or connections to the local power source (shit load of cables going into a big hole).
Neither can happen overnight, and neither can happen in secret.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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