The threatening message received by a US Navy ship in the Strait of Hormuz may have come from a notorious radio troll known to seasoned skippers as the "Filipino Monkey."

Indeed, the voice in the audio sounds different from the one belonging to an Iranian officer shown speaking to the cruiser Port Royal over a radio from a small open boat in the video released by Iranian authorities. He is shown in a radio exchange at one point asking the U.S. warship to change from the common bridge-to-bridge channel 16 to another channel, perhaps to speak to the Navy without being interrupted... “For 25 years there’s been this mythical guy out there who, hour after hour, shouts obscenities and threats,” he said. “He could be tied up pierside somewhere or he could be on the bridge of a merchant ship.”

And the Monkey has stamina. “He used to go all night long. The guy is crazy,” he said. “But who knows how many Filipino Monkeys there are? Could it have been a spurious transmission? Absolutely.”