It has long been rumored that a U.S. Navy aircraft carrier group was successfully tracked by a Singapore Navy submarine in South China Sea. The photo of the carrier coming into the periscope sights has now surfaced in a video by the Republic of Singapore Navy.
The silent hunter was RSS Chieftain, a Sjöormen-class submarine that previously serve as HMS Sjöhunden in the Swedish Navy. Sold to Singapore in the 1990s, the submarine took the picture back in 2002.