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.
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- 18 Easy Paleo Diet RecipesTry these high-protein breakfasts, lunches, and dinners.
- 7 Surprising Sugar BombsBeware of these sneaky sources of the sweet stuff.
- Get Dressed DownSporty outerwear that works with your work clothes.