['they', 'find', 'cavern', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'declare-29.4', '<LOCATION>3', 'EmptyParameter', 'EmptyParameter']
They find a cavern with a pool of thick, metallic liquid, packed with deuterium, with other pools nearby.
<PRP> find a <LOCATION>3 with a Synset('game.n.01') of thick, Synset('metallic.a.01') liquid, packed with deuterium, with Synset('other.a.01') Synset('game.n.01') nearby.