A working knowledge of how to construct an emergency shelter is an important survival skill. I found this nice video that shows how to construct one.
The spruce root as cording was an interesting tip. Although I would have to get better at my tree identification skills to make that one work. I know its a pine/evergreen.
An important point made by the instructor is the necessity of a good axe. I don’t know how many campers or hikers routinely carry one due to the size and weight, but it may be a good idea to consider what you would use for the purpose. Those cable saws are nice..I have owned one or two but they certainly are labor intensive and time consuming to use.