Our resident survival expert and author of The Ultimate Bushcraft Survival Manual, Tim MacWelch, says that you want to construct a people nest. The more confining and claustrophobic you can make your shelter, the better it will ultimately suit your needs. Small tight spaces are ideal because they're easier to keep warm and they require less effort to make, which in turn, burns less calories. Tim says to look for a small cave, a ledge or cornice, and if you're in deep snow, to hollow out a tree well because the overhead bows will serve as an efficient roof. Make sure you listen to this week's survival installment with Tim MacWelch for crafty ingenious methods for constructing an all-natural shelter. For more on Tim or to find out about his survival classes visit www.advancedsurvivaltraining.com. Tim is also Outdoor Life's Survival Blogger and you can check that out at www.outdoorlife.com/survival.