The world’s ocean currents are driven by variations in density and caused by variations in salinity and temperature. These currents exist in layers within the water column. In this lesson, students observe and replicate a model of ocean layering using knowledge about the physical properties of water that cause layering. Students are challenged to create a model to determine if the mythical Davy Jones’ Locker is possible: float a vial at the surface, float a vial at mid-water and sink a vial to the bottom.