Dig box?

[Jessicaahannah]

I want to make a dig box for my Marmalade, but im so confused on what substrate to use? I wanted to just use coconut husk stuff cuz it seems the safest. But ive also heard top soil and play sand is ok too? Any one have experience with dig boxes? Post pictures please!

 

[CooperDragon]

Most of the dig boxes I've seen use a combination of damp play sand and organic topsoil mixed to a consistency that will hold a stable tunnel. They are made in big rubbermaid bins.