The Ballistic Research Laboratories detonation-driven shock tube was utilized to expose four complex tunnel models to high pressure blast waves. The models were exposed to shock pressures of 200, 500, and 800 psi. The data obtained from the shock tube tests were reduced, plotted, and extrapolated to give expected values for the models when exposed to a 1500 psi shock wave from a 10 megaton nuclear weapon. Air Force Liaison Office Marine Corps Liaison Office Navy juiais^n Office CDC Liaison Office D&PS Branch Library S8