You would be surprised how much toxic industrial waste is been currently stored in deep geological repositories.

For example Herfa-Neurode underground repository contains (as of 2025):

https://www.kpluss.com/en-us/our-business-products/waste-man...

690,000 tons of waste containing dioxins and furans , 220,000 tons of waste containing mercury, 127,000 tons of waste containing cyanide, and 83,000 tons of toxic waste containing arsenic. Each year additional waste is added and it will be toxic forever.

https://de.wikipedia.org/wiki/Untertagedeponie_Herfa-Neurode