With only one entry and exit point, going below the ice can be dangerous, but it's worth it. Ice diving transports you to a totally different world, one with crystal-clear water and alien marine life. Getting ready requires training beyond a regular certification—go to padi.com to find a course. Then visit our favorite location: Banff National Park in the Canadian Rockies.
Looking to add some adventure to your next winter outting? We've got five extreme sports you can't pass up.
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