The Asse is a people problem, caused by incompetence. Look who is responsible for it, if you like to ;)
Furthermore, to my knowledge there is no higly radioactive stuff stored down there, just some recklessly offloaded cans with cleaning clothes, and such. Again, incompetence and recklessness.
As of now, anything highly radioactive is stored above ground in 'Castor' either under clear skies, or light halls there, or as 'Zwischenlager' on the grounds of NPPs, maybe sometimes exported to make it a problem of other people, as usual...
Anyways, we could possibly transmutate it, like it is researched in Mol, Belgium, 'burn' its full potential in liquid-salt reactors, whatever. This whole longterm storage concept is shizophrenic thinking, because we didn't really research nuclear further, after we had working reactors based on (upscaled)military applications for economic, political, whatever reasons.
I am sure that we will experience very expensive disasters with renewable energy in the next few dozen years.
edit: Another thing regarding long term storage in 'geologic times'. If some group in 100.000 years. or later comes across this, and doesn't know how to handle it, why should I care about those stupid morons?
For all I care they discovered the curse of the atomic pharaos, and deserve it! Degraded bitches!
F-U-C-K-I-N-G-D-E-A-L-W-I-T-H-I-T!