Recent damage to the Nord Stream pipelines 1 and 2 has highlighted the vulnerabilities of the critical undersea infrastructure which our modern societies so heavily depend on. As our societies turn more dependent on these undersea systems- the question of the security, protection and resilience of critical undersea infrastructure is put to the forefront. In an European context both the policy of EU and NATO is analyzed to examine how two of the European institutions with the highest decision-making capacity is responding to the situation. Through qualitative content analysis, the research paper aims to delve into the development of European critical underwater infrastructure. With a theory testing perspective both critical junctures theory and securitization theory is applied to the specific event of the Nord Stream-sabotage and its following aftermath. The results of the study implied, through operationalized criteria, that a) the Nord Stream-sabotage could be seen as a critical juncture in relation to the development of the critical undersea infrastructure and b) confirmed the securitization of European critical undersea infrastructure.