Nuts for food in the storage

When I was in the scouting group, I had been to campsites before that I visit regularly. What we usually do is to hide something under the ground, particularly food, that we can use when we come back after some months. The best food to hide was the pili nut. It is like macadamia with a very tough shell that maybe it can be preserved for years. When we come back to the campsite, the boy scouts with us were surprised to see me unearthing a small bag of pili nuts. It's easy to open them by using big stones as the nutcracker.