“Now, then,” Eddie’s father picked up the conversation again, “after managing to steal certain blueprints during the week, the men would naturally pick Saturday—their day off—to schedule the pickups by the submarine. We’re still assuming, of course, that a submarine actually is being used. It seems the only logical means of getting in and out past our alert Coast Guard. By timing the patrols, they would know when to surface. They would know how long to allow for their divers to row into the bay, get the tube, and return to the sub before the patrol doubled back. It’s possible, even, that the submarine carries a small seaplane. After returning to unpatrolled water, they could launch the seaplane to deliver the cylinder to some surface vessel, or possibly to an island or other land base. The submarine itself probably stays around for other pickups.”