It was decided to use Asse in the 1960s and 1970s but this is seen as a licensing failure: The complex is in the upper portions of the salt, which are now unstable and increasingly allowing the ingress of groundwater. Ultimately this would be expected to erode waste canisters and allow contamination of groundwater.
Wow! This follows my scenario for the Bruce Waste Fiasco perfectly! Of course, Bruce hasn't even started yet, but one day they will have the nerve to open the environmental review show.