A collapsed tunnel, impassable without excavation.
Entries
1:
Wide and tall, letting much daylight into the entry chamber.
2:
A wide sinkhole.
3:
An easy to spot, narrow passage.
4:
A steep, slippery sloped tunnel.
5:
A man-made tunnel.
6:
A collapsed tunnel, impassable without excavation.
7:
Marked with several warning signs.
8:
Hidden by the terrain
9:
Hidden by vegetation
10:
Difficult to access
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