A year later, in September 1941, he and a fellow <e1>prisoner</e1> dug a <e2>tunnel</e2> from an incinerator to a point beyond the perimeter.
A year later, in
A year later, in September 1941, he and a fellow prisoner dug a tunnel from an incinerator to a point beyond the perimeter.
<triplet> prisoner <subject> tunnel <object> Product-Producer(e2,e1)