The Iranian navy has launched a new submarine, a Sina 7. The boat has attracted attention because of its startling colour—a very light blue, even turquoise. Presumably it is a mistake, and someone in the Iranian dockyard used the wrong paint. The boat would have to go pretty deep to avoid visual detection from the air.
Even a submarine with a startling paint job can be a problem, though, given Iran’s bellicose regime and its position on the north side of the Strait of Hormuz. It has been estimated that 20% of the world’s oil supply passes through the Strait, with an average of fourteen tankers traversing it daily.
Any submarine can pose a serious risk to a surface ship. Even a turquoise submarine will be attracting observation by the west’s navies.