Depends entirely on the situation . Survival entails rescue . Ideally if it ' s an extended rescue , you ' ve been out for a while , you ' re going to try to self rescue at some point if SAR fails get yourself out of there , so a permanent shelter isn ' t ideal on the move . It is also a great deal harder to make and will burn more calories you need in making it . You will also try to get seen and increase visibility . Historically , a fire can be a great way of accomplishing this . Fire also has a way of keeping apex predators away from your camp . <| sep |> About as slow as 99 % of their clientele walk in front of you when you ' re on your lunch break and just need to grab a sandwich before that important meeting starts . Also , they ruined the meal deal . Fuck Sainsbury ' s .