"There is nowhere on the SS United States that doesn't reward careful study and includes the things you can't actually see," says author-illustrator David Macaulay.In this post, Macaulay reveals the intricate construction methods of a part of the ship that is normally under the waterline and not visible: the peak tank. Click the image to enlarge and read Macaulay's notes.Stay tuned for Peak Tank, Part 2, where Macaulay reveals more hidden details of this critical part of the ship.