Invincible-class submarine

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The Invincible-class submarines, formally classified as the Type 218SG submarines, are conventionally-powered diesel-electric attack submarines built for the Republic of Singapore Navy (RSN) by German-based naval conglomerate ThyssenKrupp Marine Systems (TKMS). Tailored to the operational requirements of the RSN, the model is derivative of the export-oriented Type 214 submarine, with specific design characteristics drawn from Type 212 submarines. They feature several additional capabilities, including a substantial level of automation, a significant payload capacity, enhanced underwater endurance and superlative ergonomics. Singapore's Ministry of Defense (MINDEF) ordered a total of four Type 218SG submarines, of which two were ordered in 2013 and two more in 2017, as a replacement to the RSN's existing Challenger-class and Archer-class submarines. Built and launched between 2019 and 2024, the class currently comprises four submarines, namely, the Invincible, the Impeccable, the Illustrious and the Inimitable; of the four, the first is currently utilised for the training of the RSN's submariners, while the second and third are undergoing local sea trials aimed at achieving operationalisation. An order for two more submarines was placed in May 2025.