As a result of the disaster at the Naval Ammunition Depot at Lake Denmark, N. J., in July, 1926, improved storage is being arranged for large quantities of TNT at the Naval Ammunition Depot at Hawthorne, Nev., at the Navy Mine Depot at Yorktown, Va., and at the Naval Ammunition Depot at Oahu Island, Hawaii. Millions of dollars are to be spent, and these projects are probably more extensive than others yet undertaken anywhere to furnish permanent, and particularly safe, peace-time storage for large quantities of military high explosives which are on hand.
At all of these places one will find no pretentious storage buildings. Instead he will find the whole area covered with equidistant groups of small cement “igloos.” Each of these igloos, of identical size, will be shaped like a semi-cylinder with its axis on the ground, with earth piled against its sides as a barricade so as nearly to conceal it from view. There will in each group be seven igloos, i.e., a central one with six others around it as on the comers of a hexagon.