Getting rid of exotic caulerpa seaweed has proved challenging globally. But here in New Zealand, with the help of a government funding boost, innovators are developing new world-leading ways to kill this invasive pest. One method currently on trial is a new underwater enclosure that seals to the seafloor to target and contain chlorine to large areas of caulerpa, quickly killing the algae and allowing the treated area to quickly recover. This method has been developed by inventor Brook McRae from