你所謂的標準,是你自己想像的! The first submarine, christened as the Invincible, was launched in an elaborate ceremony on 18 February 2019, with defense minister Ng Eng Hen and representatives of the RSN in attendance.[43] During the ceremony, Ng revealed the names of the other three submarines, namely, Impeccable, Illustrious and Inimitable.[44] Invincible began its initial sea trials in September 2020, with its planned delivery date scheduled for 2020.[45]