2.009 is an intensive product design capstone class for MIT MechE seniors, with the goal of designing, prototyping, and presenting an original product. My team of 18 students created Neptune, a wireless underwater communication system to increase safety for novice scuba divers. My roles on the team included: leading user testing & user interface design; co-leading PCB design for the final version of the system; contributing to the mechanical design of the housing and armband, including waterproofing and pressure testing considerations; helping spearhead the final system integration effort as someone with knowledge of both the mechanical and electronic aspects of the system. Throughout the class, I also gave multiple presentations on behalf of my team at various milestones and contributed to presentation materials such as product specification sheets and slide decks. The final product was presented with full functionality in December 2024 to a live audience of thousands (in-person + online), reflecting a great teamwide effort of concept generation, design, testing, user outreach, programming, integration, communication, and high-precision fabrication.