4. The final view will allow you to see where the tunnel begins and where it ends.
5. In Figure 4.9, all of the points of this type of tunnel are explained.
1. Beginning of the tunnel.
2. First lowest signal generated by the tunnel.
3. Peak in the center of the tunnel. (This typically represents the highest point on the inside
of the tunnel.)
4. Last lowest signal generated by the tunnel.
5. End of the tunnel.
To verify that it is a tunnel, do the scan multiple times perpendicular to the tunnels paths.
Most tunnels are fairly long and will produce a semi-constant signal over a larger distance.
In the event that a tunnel ends abruptly and you can narrow down both sides of it, it will
most likely be a void or sinkhole under the surface.
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