['they', 'beam', 'EmptyParameter', 'chamber', 'to'] ['chamber', 'reinforce', 'EmptyParameter', 'tritonium', 'with']
['<PRP>', 'light_emission-43.1', 'EmptyParameter', "Synset('structure.n.04')", 'to'] ["Synset('structure.n.04')", 'support-15.3-1', 'EmptyParameter', 'tritonium', 'with']
They beam down to an underground chamber that has been heavily reinforced with tritonium in order to make it last indefinitely.
<PRP> beam down to an underground Synset('structure.n.04') that has been heavily reinforced with tritonium in Synset('document.n.01') to make <PRP> Synset('last.a.02') indefinitely.