A Study of the Potential Use of Underground Space (SPUN) - 1990

• Examination of potential use of underground space
  
  
• An initiative of the Metroplan for the 1990s
  
  
• Outline feasibility studies for seven different schemes: (Oil/LPG storage, warehouse, sewage treatment plant, container freight station, refuse transfer station, commercial/GIC, tractor and trailer park)
  
  
• Comparison of capital costs between the surface and cavern options