They retreat through Golgotha in stages, lugging battery packs with them and unrolling the wires as they go, dynamiting the tunnel sections behind them one by one. As they do this, certain oddities of the tunnel system finally become clear to Rodolfo, Wing, and Bong. It becomes fully evident to them, for the first time, that the entire complex was carefully designed by Goto Dengo to serve two entirely contradictory purposes. To a loyal Nipponese engineer like Captain Noda it looks like precisely what he was ordered to build: a vault laced with booby traps. But to the four men sealed inside, Golgotha has a second function. It is an escape machine. As the purposes of certain rooms, drifts, and other features suddenly become clear, they straighten up, blinking, and turn to look at Goto Dengo, with the same expressions as the soldiers wore, weeks ago, when they discovered the Buddha in the Mercedes.