https://www.mindef.gov.sg/web/porta...eases/article-detail/2019/February/18feb19_nr
Invincible is the first of four customised submarines designed for operations in Singapore's shallow and busy tropical waters. Custom-built to Singapore's needs, the new submarines will possess longer endurance and higher payloads. Following the launch, Invincible will undergo a series of sea trials before delivery to Singapore in 2021. The remaining three submarines are under construction. Dr Ng also announced the names of the remaining three submarines – Impeccable, Illustrious, and Inimitable.
Invincible is the first of four customised submarines designed for operations in Singapore's shallow and busy tropical waters. Custom-built to Singapore's needs, the new submarines will possess longer endurance and higher payloads. Following the launch, Invincible will undergo a series of sea trials before delivery to Singapore in 2021. The remaining three submarines are under construction. Dr Ng also announced the names of the remaining three submarines – Impeccable, Illustrious, and Inimitable.