Assertion: national park's trail | /r/HasProperty | plunge
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Source sentences:
text: Don’t Miss: Two trails—the Balconies Cave Trail on the west and the Bear Gulch Cave Trail on the east—plunge into pitch-black talus caves, narrow canyons that have filled with rockfall ranging from huge boulders to rocky debris; over time, flowing water has eroded passages that hikers can scramble through.