Immediate actions are required to address global warming and climate change, which may involve storing large amounts of anthropogenic CO2 in geological and oceanic repositories. In terrestrial storage sites, CO2 tends to rise due to the underground temperature profile. Therefore, if the reservoir is not properly sealed, stored CO2 can escape from geological formations. On the other hand, oceanic sequestration holds great potential for long-term CO2 storage beneath the seabed, supporting the broader scientific and industrial community in achieving carbon neutrality. Subsea CO2sequestration holds significant promise for ensuring stable, long-term CO2storage and, consequently, can make a substantial contribution to achieving global carbon neutrality and mitigating the challenges of global warming. However, several key factors at the macroscopic level, including salinity, sediment porosity, sedimentary types, and the use of additives, are essential in realizing the full potential of subsea CO2 sequestration. These dimensions offer a vast landscape for discussion, paving the way for future technological innovations. Consequently, there exists a broad scope for discourse in this field that will drive the development of novel technologies in the years to come. However, there is extensive room for discussion in this area, opening new possibilities for future advancements. Analysis indicates that, at depths exceeding 2800 meters, CO2 is denser than seawater, providing an additional gravitational barrier to prevent CO2 from escaping. The comprehensive analysis of the conditions for CO2 sequestration, as well as the challenges and prospects related to hydrate-based CO2sequestration in oceanic environments. Additionally, we emphasize the critical role of negative buoyancy and hydrate-forming zones (NBZ/HFZs) and analyse the depth criteria in oceanic settings. Sequestration in the NBZ region offers stable storage for many years, even in the presence of geological disturbances and earthquakes. However, the depth of HFZ and NBZ regions depends on factors such as sediment type, storage conditions, temperature, and pressure. Delving into the realm of CO2 sequestration within subsea sediments in solid hydrate form need special focus on the chemistry of interactions and the broader environmental impacts at the pore scale during hydrate formation and growth. This offers valuable insights into the aspects of CO2hydrate formation and its sustained stability concerning porous media, interactions between CO2 and sediments, the influence of additives, and potential cost estimates associated with large-scale CO2 storage in oceanic environments. A deeper understanding of the chemical interactions among CO2, hydrate-bearing sediments, additives, and marine environments is crucial for comprehending hydrate formation within subsea sediments.

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