This thesis takes an international relations liberal institutionalist approach, combining it with the international political economy concept of double effect. The paper develops an approach which is suited for critiquing the liberal international order without arguing for another theory, aiming to find ways in which the liberal international order can be improved. This is used to investigate the issue of damaged infrastructure in the Baltic Sea from January 2022 to April 2025. The paper argues that the Baltic Sea is experiencing more negative than positive effects. The thesis takes a neo-positivist approach, combining congruence testing with process tracing and doctrinal law analysis to analyse the liberal international order. The liberal international order is represented by the mechanisms of collective security, economic interdependence and the rule of law. These mechanisms are further represented by NATO, the EU and UNCLOS. The thesis concludes that, as of the time of writing, the liberal international order has a double effect in the Baltic Sea. Baltic states integrated in the liberal international order are not able to attain security through the use of these mechanisms. The thesis has 13943 words.