Our students participated in the Hong Kong Robotic Olympiad 2021 organized by the Hong Kong Robotic Olympic Association under the arrangement between Physics and Design & Technology Club. Apart from a series of Robot Swimming Competition such as Backstroke, Breaststroke, Butterfly Stroke and Freestyle, activities also included Robot Fish Short Distance Swimming Competition with both vertical and horizontal styles. Through this competition, students not only enhance their physics'knowledge by applying the lever, fluid mechanics principles and Archimedes' law, but also develop their creativity by using the craftsmanship learnt in D & T lessons when making different types of robots.