COMPLETE aimed at delivering knowledge and tools to implement HELCOM’s roadmap for regional implementation of the outstanding issues on the IMO Ballast Water Management Convention (BWMC) in the Baltic Sea and also assist relevant authorities in implementing Regulation (EU) No 1143/2014 of the European Parliament and of the Council, aiming to protect native biodiversity and ecosystem services. The project continuation, COMPLETE PLUS, aimed at implementing the outcomes of the COMPLETE project.