The overall strategy, vehicle design elements, and experimental result from VantTec for RoboSub 2020 are presented. The strategy was constructed as a two-year plan, and from experience from RoboBoat competitions. The higher priority was given to have a robust and reliable hardware and software system to use as a base for future editions, and to develop autonomy capabilities such as object and sound detection and localization, and path-following control. Hence, the Gate and Buoys challenges are the priority tasks to tackle, as they do not require any additional hardware components than the base system. Members were divided in mechanical, electrical, and software areas, with a balance between software or hardware experience. Moreover, the main mechanical and electrical design elements are the frame, enclosures, PCBs, and sensors and actuators, which bring the desired ro-bustness and reliability. Likewise, the system architecture design connects the required components for hardware and software communications, achieving determinism and task prioritization. The software architecture design allows for modular integration of the required software components. Next, computer vision and path-following control algorithms allow the VTec U-III unmanned underwater vehicle to perceive obstacles and navigate through planned waypoints. Furthermore, as the COVID-19 pandemic grew, the proposed strategy adapted to exchange manufacturing time for design time, and all of the challenge-oriented hardware components were designed. Similarly, the course approach was fully implemented in simulation, where results show successful completion of path-following control , and the Gate, Buoys, and, additionally, Torpedo competition tasks. Finally, results indicate the computer vision algorithm is capable of detecting the proposed RoboSub 2020 obstacles.