This 22-page report describes the design and construction of an underwater remotely operated vehicle (ROV). This report was created by Deep Ocean Robotics, a group of homeschooled students from the United States and Europe that participated in the 2021 MATE ROV competitions Ranger class. MATE ROV is a global underwater robotics competition for STEM students. The competition includes Explorer, Ranger, Navigator, and Scout classes.In the report, an abstract introduces the project. The company is then introduced, the project's environmental responsibility is outlined, the group members are listed, and consultants are also listed. Next, the ROV's mechanical, electrical, and software design a...