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The contamination from Asse is minimal and at depths like -900 m that are never reaching any surface waters. Asse stores low- and medium-activity waste. For example, the largest leak found was 240 kBq/l which is roughly natural (!) radioactivity of a group of 60 people (from K-40 isotope).
One of the main causes for Asse problems was anti-nuclear lobbying, which hindered any attempts to properly develop and secure the storage and eventually led to its closure.
