DIY ProjectsEmergency PreparednessHome Various Methods For Creating Underground CACHE TUBES For Valuables By Melissa Francis - August 31, 2012 0 96 FacebookTwitterPinterestWhatsApp http://people.virginia.edu You must always have a plan B. Vacuum sealing all items to remove air but more importantly to create a waterproof bag is a vital to securing the items you choose to safeguard. Items to possibly store: Gold & Silver