ProtectedSubmarines Singapore’s launches fourth Invincible Class submarine By ANI - April 27, 2024 0 750 The launch of Singapore submarine Inimitable On 22 April the Inimitable, the fourth and final submarine in Singapore’s Type 218SG Invincible class program was launched at the Thyssen Krupp Marine Systems (TKMS) shipyard in Kiel. Please Login to view this content. (Not a member? Join Today!)