Letter Re: Constructing a Permanent Underground Cache
James Wesley: I appreciate your survival ideas over the years. Here, in the Caribbean, we use cisterns for water recovery quite a bit. I’ve had occasion to make a cache lately from one of the smaller plastic cisterns, such as this one. The tanks that come here (Cayman Islands) are black and configured somewhat differently, but same basic idea. They employ a screw-top opening, which can be weatherproofed against all but profound water pressure. I set mine — a 750 gallon tank — in the sandy loam and made sure that the bottom third was all clean fill, especially under …