India’s evolving strategic posture in the Indian Ocean region (IOR) is reflected by its pursuit of Continuous at Sea Deterrence (CASD). CASD represents a critical element in the strategic posture of a nuclear weapons state, involving permanent deployment of at least one ballistic missile submarine (SSBN) at sea to maintain a constant and invulnerable second-strike capability. The article discusses the challenges and opportunities with respect to implementing CASD like improved submarine technology interoperability, and strengthening safety protocols. In addition, it deliberates on how India’s CASD posturing affects regional stability as well as deterrence credibility. It critically examines the readiness, deployment, posture, and operations associated with CASD in relation to Indian military forces thereby offering insights on the prospects and challenges of CASD as the pillar of India’s maritime strategy. A qualitative research methodology is used by utilizing a combination of strategic analysis and expert interviews to assess the effectiveness and prospects of India’s CASD. By offering a detailed evaluation, the article contributes to the broader understanding of maritime strategy and nuclear deterrence in the IOR.