5月22日,为新加坡海军改装的原瑞典海军的“海狗”号潜艇,在瑞典的考库姆公司的卡尔斯克鲁纳造船厂下水,并被重新命名为“酋长”号。“酋长”号是新加坡海军的第4艘也是最后一艘进行改装的潜艇。该项目是对4艘瑞典“海蛇”级潜艇进行改装,适于热带地区作战。第1艘艇于1995年定购,而到1997年,新加坡提出增加改装3艘艇。项目中还包括了提供文件、备件和人员培训。 On May 22, the former Swedish Navy “Sea Dog” submarine, modified for the Singapore Navy, launched its water at Karlskrona Shipyard in Kaukum in Sweden and was renamed “Chief”. “Chief” is the Singapore Navy's fourth and final submarine for modification. The project is the conversion of four Swedish “sea snake” class submarines, suitable for combat in the tropics. The first vessel was ordered in 1995, and by 1997 Singapore proposed to retrofit three more vessels. The project also includes the provision of documents, spare parts and personnel training.