The metals company whose broken reservoir killed 10 people last year when several Hungarian towns were flooded with caustic red sludge has been fined the equivalent of about $647 million for environmental damages. The 25-acre reservoir at the plant owned by the MAL Hungarian Aluminum Production and Trade Company released a torrent of about 184 million gallons of red sludge, a byproduct of aluminum production, on three towns in western Hungary in October 2010. The highly caustic material injured more than 150 people, many of whom suffered chemical burns.