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| Getting to the subway does require some route-finding and rappelling, so it's not for the inexperienced |
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| Only 80 permits are issued per day and they can be difficult to get during peak times in spring and summer. |
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| While the subway itself is only a quarter of a mile long, getting there is a somewhat difficult 9.5-mile hike round trip |
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| If you want to bring your friends you'll have to be selective; groups of more than 12 are not allowed. |
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| Algae thrive in the low light deep in the subway tunnel, causing the vibrant greens seen in these |
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| As swimming is required in some areas, going in the warmer months is advised. |
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| The subway is located between two peaks named North and South Guardian Angels. |
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| Heavy snow melts and spring runoff can flood and shut down the subway, so make sure you check the train schedule before heading out |
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