The document describes a game called FATHOM that was designed to be played by students in the National Geographic exhibit on sunken Spanish galleons. The game involved students working in dive teams to answer questions to uncover artifact cards located on a mock seabed mat. If a dive team answered enough questions correctly, they could find the corresponding artifact in the exhibit. Students had to record the location of artifacts using measuring tools to simulate the work of real underwater archaeologists. The game aimed to teach students about diving, galleons, treasure, and conservation in an interactive way.