Suggestion:(unlike the America 'Yukka Mnt.Pepository', which took forever to select & extremely expensive, limiting in size and once ,sealed' making future unseen problems difficut to UNDO!) Since, temporary storage (now over 30 years) have proven easy to monitor and cost effective. I suggest, a continuation of above ground storage using 'designer CUBES'.Once, a standard is set for these 'cubes' as containers (made of steel plates/wire meshing/cooling tubes and poured contrete at the time the 'waste filled drums' are placed into them (2-10 ton blocks-not easily stolen)then these ,interlocking cubes (like LEGO blocks) can be assembled into huge grid units in remote sites in the NWTerritores for longer storage (100-years)