When someone mentions a bug-out shelter, most people immediately think of an above ground structure.
One obstacle to building an above ground structure for a lot of people is cost.
What few people consider is building an underground shelter.
If they do, that assumed costs and access to light generally turns them off.
By being resourceful, however, an underground shelter is both affordable and you can design it to take advantage of natural light sources to raise the level of ambient light in the dwelling.
On the next page, one old-timer explains in detail how he was able to build an underground structure very inexpensively by using scrap wood, doing the labor himself and utilizing common sense design features to capitalize on natural lighting.