SRL for [swept]: Despite all these innovations , most of the diamonds are still found in the sand [swept] away by the men wielding shovels and brushes -- the ignominiously named `` bedrock sweepers '' who toil in the wake of the excavators .
ARG-1: the sand | ARG-M-DIR: away | ARG-0: by the men wielding shovels and brushes -- the ignominiously named `` bedrock sweepers '' who toil in the wake of the excavators