Victims and plaintiffs gather outside London's High Court, where a trial is set to determine whether Australian mining giant BHP is liable for one of Brazil's worst environmental disasters. In 2015, a dam co-owned by BHP collapsed, unleashing a deluge of toxic mud into villages, fields, rainforest, rivers and the ocean, killing 19 people. "In Brazil they don't listen to us," says Ana Paula Alexandre, whose husband was one of those killed. IMAGES AND SOUNDBITES