The Black Pearl - Morvaride Siah - مروارید سیاه

A Russian scientist is supposed to meet an American agent. However, as the KGB agents are informed and get involved, the meeting is called off and the scientist flees. He seeks to get himself to the Persian Gulf waters, passing through Iran. Now, he is not only followed by CIA agents, but also Iranian special agents are informed about the issue, and have started taking measures against it.