['they', 'hear', 'drill', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'discover-84', "Synset('activity.n.01')", 'EmptyParameter', 'EmptyParameter']
And then, after hope against hope, they hear the phaser drills hitting the rock around them.
and then, after Synset('belief.n.01') against hope, <PRP> hear the <OBJECT>2 Synset('activity.n.01') hitting the Synset('music_genre.n.01') around <PRP>.