Not only did I do it on Edgenuity, but it's simple. If sea level is 0, and the diver went 25.6 feet below sea level, they would be left at -25.6 feet from the surface. If the diver dove 25 feet back up, they would be left at -0.6 feet. If they dove back up 0.6 feet, they would be at the surface on the water, which is 0. 25 + 0.6 = 25.6. It's that easy.
