Then there is a log containing everything U-691 is ever known to have done, in chronological order. The first entry is its launch, at Wilhelmshaven on September 19, 1940, followed by a long list of the ships it has murdered. There’s one odd notation from a few months ago: REFITTED WITH EXPERIMENTAL DEVICE (SCHNORKEL?) . Since then, U-691 has been tearing up and down like mad, sinking ships in the Chesapeake Bay, Maracaibo, the approaches to the Panama Canal, and a bunch of other places that Waterhouse, until now, has thought of only as winter resorts for rich people.