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This slide shows an anomolous rise in A tunnel that correlates with a topographic depression. |
| On the right, a diver is passing over huge fallen boulders probably associated with a ceiling collapse. |  |
|
This slide shows an anomolous rise in A tunnel that correlates with a topographic depression. |
| On the right, a diver is passing over huge fallen boulders probably associated with a ceiling collapse. | |