The emergence of Small Modular Reactors (SMRs) presents a promising avenue for a nuclear renaissance, particularly for newcomer countries aiming to achieve net-zero carbon emissions. SMRs, especially when located underground, not only boast superior safety and security features but also offer more economical construction and life-cycle costs compared to traditional aboveground nuclear power plants (NPPs). Following global efforts towards reducing carbon emissions, the nuclear industry faced setbacks post the Fukushima accident in 2011, leading to increased scrutiny of operational safety. However, SMRs have reshaped public perception of nuclear energy, given their smaller environmental footprint, advanced safety features, and flexibility in power generation capacities. One of the most significant advantages of underground SMRs and NPPs lies in the unmatched protection they offer against both military threats and natural disasters. The geological formations surrounding underground reactors provide exceptional safety levels, surpassing those of traditional aboveground structures. Studies suggest that the Fukushima disaster could have been averted had the NPP been built underground, showcasing the resilience and protection underground facilities can offer. Contrary to popular belief, building underground NPPs can be cost-effective, particularly with advancements in construction techniques like drill and blast tunnelling. SMRs further enhance the economic feasibility by being factory-assembled and easily transportable for underground installation. Moreover, the flexibility in siting SMRs near city centers not only enhances safety but also addresses land scarcity issues, making them an attractive option for urban settings. Public acceptance of SMRs and underground NPPs is on the rise, with tech giants like Google and Amazon exploring these solutions for their energy needs. However, challenges like the NIMBY syndrome may hinder progress, necessitating robust public education on the benefits and risk management of nuclear energy. As the world navigates towards cleaner energy sources, the integration of underground SMRs could mark a significant step towards sustainable and secure power generation.