The first three books he consults contain more than enough detail to perfectly reproduce the crestfallenness that Randy experienced when he learned about flight plans. Before he’d opened the books Randy had gotten out his mechanical pencil and his graph paper in preparation for making marks on the page; half an hour later he’s still trying to get a handle on the contents of the tables, and he hasn’t made any marks at all. He notes that the depths in these tables only go down as far as a hundred and thirty, and at that level they only talk in terms of staying down there five or ten minutes. And yet he knows that Amy, and the Shaftoe’s colorful and ever-enlarging cast of polyethnic scuba divers, are spending much longer at this depth, and are in fact beginning to come up to the surface with artifacts from the wreck. There is, for example, an aluminum briefcase wherein Doug hopes to find clues as to who was on this U-boat and why it was on the wrong side of the planet.