There was a previous Swedish tunnel project that had a number of incidents, among others groundwater pollution caused by a new sealing compound that contained a

There was a previous Swedish tunnel project that had a number of incidents, among others groundwater pollution caused by a new sealing compound that contained acrylamid https://en.wikipedia.org/wiki/Hallands%C3%A5s_Tunnel https://en.wikipedia.org/wiki/Hallands%C3%A5s_Tunnel