Iran has ended its large scale Great Prophet 9 exercise in the Persian Gulf, test firing a “new strategic weapon,” which it says will play an important role in the future battle against the US.

The test was performed on the final day of the exercise, staged by the Iranian Revolutionary Guard in the strategic Strait of Hormuz, through which about one-fifth of the world’s oil passes.

“The new weapon will have a very decisive role in adding our naval power in confronting threats, particular by the Great Satan, the US,” Admiral Ali Fadavi, Iran’s navy chief, told the Revolutionary Guards’ website.

In an interview with Iranian state television, Fadavi added that details about the new weapon may be made public in coming years.

Iranian state TV showed a short video of missiles being fired into the sky from under water during daytime, AP reported.