Modern man, lulled into a false sense of security, often behaves in an unnecessarily relaxed manner. After all, if something goes wrong, you can get a tiny computer out of your pocket and find the answer to any question in it or call for help. But what if a disaster occurs and you have to rely only on yourself? Are you ready for this? Do you know enough and are able to survive - in a waterless desert, on the high seas after a shipwreck, during an assassination attempt, or if an armed robber breaks into a house? Clint Emerson, a retired US Navy Special Forces officer, describes in his book skills, many of which are taken from the arsenal of intelligence officers, and they often have to operate in extreme conditions, at the limit of vitality, when it is necessary to quickly and accurately make the only right decisions. In a deadly situation, when the count goes to a fraction of a second, these skills will help an ordinary person save a life - his own and those around him.