Goto Dengo's mines, and my questions

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I just finished reading our section for Wednesday, and I am a little confused about what happened in the last thirty pages (or so) with the mines Goto Dengo has been working on. Why is there a "trick vault?" And why does there seem to be so much secrecy, i.e. the comment "I will give you instructions. We will make a special shaft" (678) that Goto says to Wing? Is Goto trying to pull a fast one, since he is in charge of the whole mining operation? And this mine is just supposed to be a shelter for Japanese gold? I'm sorry if these are stupid questions... i just don't quite understand it yet!

I think the point of Goto's secret work on Golgotha was to make sure that he and his crew can get out alive. The plan seems to be for everyone who worked on the site to die there.

As for the trick vault, my impression is that it's a way to booby trap greedy robbers in search of more or at least leave them satisfied with their small find (every 20th of the total treasure). I think it's supposed to be a shelter for the gold, at least a spiteful way of keeping the Americans from getting their hands on it, but I don't really understand the whole engineering and whatnot.