| 1. | The fourth sump has been dived for to an underwater boulder choke.
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| 2. | In September 2006 cavers squeezed through an excavated boulder choke into new passage.
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| 3. | The cave sometimes floods, with a sump forming beyond the first boulder choke.
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| 4. | Downstream, the team reached a terminus at a prominent boulder choke, through which they attempted to dig.
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| 5. | Boulder chokes can be formed by rockfall, massive earth movement, mining debris, or deposition after storms.
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| 6. | The underground debris from the collapse forms the Big Rapids and is responsible for the boulder chokes seen near Blank Passage.
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| 7. | Originally accessed through a vertical boulder choke, an access tunnel has been cut to include it on the visitor trail.
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| 8. | The stream runs through the cave until it comes to a boulder choke which has so far proved to be impenetrable.
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| 9. | Boulder chokes can present a significant danger to cavers, as unstable boulders can unexpectedly move, potentially crushing or trapping cavers.
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| 10. | Passing a little further through a few boulder chokes brings you through many wonderfully decorated chambers and eventually to the Hall of 30.
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