Installing cache tubes to hide valuables is not new. What is new is how to dig the hole to minimize the footprint. In addition, to dig deep enough to be undetectable. In these articles, information is available on how to dig holes up to 12 inches in diameter and to 20 feet deep. This is done with a Holey-Moley Vacuum Assisted Post Hole Digger.
In addition, discussions cover putting in a plastic casing such as an 8 inch PVC pipe. This allows for quick cache tube access. Retrieval is easy by just lifting the cap off the casing and having access to the tube.
Articles here also cover methods of concealing your cache tube. How to waterproof, and pack them for long term storage.
As a result of searches, it was found that many people want holes to bury valuables such as guns. Hiding guns is not much different than other items with the exception of how to prepare them for long term underground storage and rust prevention.
When Installing cache tubes underground one must consider concealment, visible footprint, depth of hole, and diameter for the primary tube. Furthermore, the hole requirement for different casing sizes too.
An 8 inch hole produces 2.21 lbs and 0.29 gallons of dirt per foot of depth. So planning on what to do with the dirt after removing it from hole is vital. This maximizes concealment.
See the hole calculators page at Cat 6 Tools for more information on hole volumes and soil weight and volumes.
