Freshwater pearl mussels restoration efforsts at river Hukkajoki, 23th August 2024. Massive environmental damage was discovered at the Stora Enso forestry site in Suomussalmi, in northern Finland. Forestry machines had been driving over a protected river Hukkajoki. The river is a crucial ecosystem for an endangered species of freshwater pearl mussels. LEHTIKUVA / HANNU HUTTU - FINLAND OUT. NO THIRD PARTY SALES.