Last November, researchers with the Clemson Conservation Center, North Charleston, S.C., held a video conference with Hamburg Area students. The center is restoring the H.L. Hunley, a Confederate submarine that sank Feb. 17, 1864. No one knows why the submarine sank. That's where the students come in. Two witnesses - a Union sailor aboard the ship that the Hunley sank and a Confederate soldier waiting on shore - reported seeing a blue light in the waters. It is speculated the Hunley's lantern cast that light, so the researchers have asked the students to recreate and test a working lantern replica. "We had a bunch of kids who said, 'Wow, I get it. We're not just playing around. This is the real deal,' " Principal Chris Spohn said. "They were intrigued by that."