This project focuses on designing a rugged, low-power wearable device that can actively monitor the vitals (heart rate and heart rate variability) of SCUBA divers and analyzes that data for the early detection of stress, hypoxia, or fatigue to alleviate medical emergencies in an underwater environment. Our design consists of two parts: a chest-mounted ECG monitor and a mask-mounted TOLED display to relay information back to the diver. Data from the sensors is filtered and analyzed using an Arduino microcontroller in order to detect the possible onset of the aforementioned health issues so the wearer can be aware of their situation in addition to allowing more time for other divers nearby to help if an emergency occurs. Other divers would be alerted via acoustic signaling or visible LEDs that a dive buddy is in distress.