A Fars story today quotes Adm. Khordad Hakimi, chief of the northern naval fleet, as saying that the manoeuvre in Iran's territorial waters will end Thursday. Hakimi says the exercise is called "Amniat e Paydar" or "Sustainable Security" in Farsi.
The admiral says that the manoeuvre is aimed at improving the readiness of Iranian naval forces.
Iran routinely holds land and sea maneuvers, including in the strategic Strait of Hormuz, where ships carrying one fifth of the world's oil supply pass through. Iran, Russia, Azerbaijan, Kazakhstan and Turkmenistan all claim different portions of the Caspian Sea.