Macron spent four hours underwater. He met with officers and crew, went through a simulation exercise and was given a tour.
During the visit to the submarine, "Le Terrible", off the Brittany coast, Mr Macron wearing a naval uniform reportedly took part in a simulated missile launch.
The drill was intended to tell the world that France won’t be intimidated, as North Korea launched its first successful intercontinental missile.
A day earlier, a 23 year old young man with right-wing stand was arrested for the attempted assassination of the French President.