This happened in 1999. In 2010, the two brothers who owned/operated the plant were sentenced to 2 years in jail and 1M euro restitution to one private plaintiff. The brothers appealed and as far as I know, this is still pending. They have not spent a day in jail, or paid a penny. The rolled up damages claims of the smaller operators and the government, totalling over $230M euro will not even reached the docket until the appeal has been handled.
Cases like this, where captains of industry come under direct threat, have a strong likelyhood of dying due to expiration under the statue of limitations. I fully expect that to happen here as well.