Secondary school students battled it out in an underwater robot war in City University's swimming pool this week. Finalists from 19 secondary schools competed in the 4th Hong Kong Underwater Robot Challenge, which had a submarine rescue theme and promoted the development of technical, teamwork and critical-thinking skills. Students were required to move their remotely operated vehicles (ROV) around a model of a stricken submarine and complete set tasks within a time limit to accrue points. The Kwok Tak Seng Catholic Secondary School team took the first prize, with Shau Kei Wan Government Secondary School named the runner-up. Third place went to Maryknoll Fathers' School. The top two teams will go forward to the Marine Advanced Technology Education International ROV Contest finals in the US state of Massachusetts in June. Students applied basic robotic technology skills they gained from City University workshops over the past several months. They received a free ROV kit and learned to design and build it before adapting the vehicle for use.