Whether you are a sportsman, survivalist, prepper, or hiker, it’s good to be prepared for emergencies, and no one is more prepared than the warriors of the SAS. Based on his eighteen years of experience, Barry Davies here offers advice on: He says the changes of survial are always good, as long as you stay camp and think clearly. To stay alive you need air, water, food, health, and shelter. The knowledge he offers in his book just might help you survive whatever hostile environment you might encounter.