The Deep Phreatic Thermal eXplorer, or DEPTHX, is preparing for another series of dives into a 115-meter deep geothermal sinkhole in Mexico. These dives follow a series of successful tests dives to shakedown the vehicle’s autonomous navigation and mapping capabilities. Astrobiology Science and Technology for Exploring Planets (ASTEP) funds the DEPTHX project as a study to develop technology that could one day allow a waterborne explorer to probe the ocean thought to exist beneath the icy outer shell covering Europa.