This position paper addresses the critical issue of seabed security, focusing on the protection of Critical Undersea Infrastructure (CUI) against sabotage threats. It outlines the strategic importance of CUI, particularly in light of recent incidents in the Baltic Sea that indicate a deliberate strategy by the Russian Federation to exploit vulnerabilities in undersea infrastructure. The paper identifies key challenges in developing effective defense and security capabilities, enhancing CUI resilience, and strengthening societal resilience against potential disruptions. It discusses the need for a robust deterrence posture, emphasizing the importance of governance systems, industrial development of dual-use technology, and international cooperation. The paper proposes a realistic approach to deterrence, prioritizing defense in high-risk areas while acknowledging resource constraints. It also highlights the necessity of improving public awareness and preparedness to mitigate the societal impacts of energy or data outages. Overall, the document serves as a comprehensive guide for stakeholders involved in seabed security initiatives.