Principle of Protection is an educational channel aimed at educating the lay-person on underground shelter standards for rated shelters. This is a 32 session presentation reviewing weapon effects in table format coving shelter hulls, air manifolds, NBC air filtration, radiation shielding from overhead, radiation shielding through the entranceway, EMP shielding, shelter systems, long-term effects of nuclear weapons. The book instructs viewers on how to evaluate and rate a shelter with drawings, photos, images and a simple narrative.