The chamber Cain sealed him into is forty paces across with four service pillars in it. Vell has said since that the first thing he looked for was the maintenance hatch rather than the animal.
There was a hatch, in the north wall, painted over at some point by somebody with a schedule to meet. That detail is in the record because the recorder Regina left running was clipped to the frame beside it.
The animal stood at the far wall under a works lamp, on a chain it did not need. A Grade Seven arena beast is a thing most hunters see once, from a stand, at a distance of ninety metres.
"Eat it," Cain said through the grille in the door plate, "or the schedule eats you."
The object in Vell's left hand was registry item 4-119, four years out of an inquest, the size of a plum stone. Cain had put it there himself before the door came down, which the recorder carries with a timestamp.
