Brazilian federal and state prosecutors have asked a court to re-open a multi-billion dollar civil action suit against miners Samarco, Vale SA and BHP for damages caused by the Fundao dam burst in 2015, authorities said on Thursday.

The incident at Samarco’s Mariana facilities, a joint venture between Vale and BHP, which left 19 dead and polluted the River Doce, was the biggest environmental disaster ever in Brazil. The claim is for damages of 155 billion reais ($27.4 billion).