Dig Plan and Digging

More info will be added here but for a start below are some basics.

  1. You plan it
  2. Confirm it works with the core route and chambers
  3. Advise us of any changes you wish to make
  4. Collect materials
  5. Dig it


  • 18″ deep
  • if under hard standing or rocky areas protect it with another duct
  • keep it tight and straight
  • don’t kink the duct otherwise it won’t blow
  • over 5m needed in a chamber
  • look at the duct knowledge page
  • get together and help each other
  • enjoy tea and cake and banter
  • Let danrobinson@b4ms.org.uk know when its dug to the wall or chamber