['he', 'explore', 'wormhole', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'investigate-35.4', '<OBJECT>1', 'EmptyParameter', 'EmptyParameter']
He had been exploring an unstable wormhole near his homeworld.
<PRP> had been exploring an Synset('unstable.a.01') <OBJECT>1 near <PRP> <LOCATION>6.