To understand the logic behind being buried even in wet soil, I remember reading something about finding yourself in cold waters. The writer said not to move too much because your clothes will trap some water wich will absorb some of your temp and becomes slightly warmer than the surrounding water . Too much movement will stirr and mix the waters and you end up with fresh cool waters touching your body which absorb more of your temp faster. Some will argue that movement will generate heat to warm you up. That is true wbut it will exhaust you and drain your temp in the long run.