During the Cold War, US and Soviet subsused to track each other, sometimes getting close enough to photograph the other's hull. A very dangerous exercise. The Soviets lost their edge when they went to nuclear subs as those generate much more noise. But the Iranian use the old electric boats which are just holes in the water. This claim seems incredible. But it's easy enough to check. If there is evidence on any US ship, the Captain's head should roll. He was negligent.
U.S. wildlife agency looking into Zimbabwe lion death (AP)
from the article: Iran Revolutionary Guards: Unit engraved emblem on U.S. ship