Over the years, the University of Hawaii students have surveyed fighter planes, landing craft, and bomb-ers lost during World War II. This summer, they spent two weeks diving to a landing craft submerged near Pearl Harbor. The field course teaches them how to measure a wreck and the surrounding ocean floor using baseline trilateration, a mapping method that doesn’t require permanent grids. They also produce underwater drawings, photographs, and videos. The maps the students create will help state and federal agencies monitor the sites and protect them from looters, preserving their place in history.