A US Navy surveillance drone, MQ-4C, disappeared over the Strait of Hormuz today - shortly after declaring an in-flight emergency alert. According to reports, the drone had completed roughly a three-hour surveillance of the Persian Gulf and the Strait of Hormuz and appeared to be returning to its base at Naval Air Station Sigonella in Italy. It took a slight turn towards Iran when it sent code 7700 (for general emergency) and started descending. The uncrewed aircraft was tracked rapidly losing altitude before it disappeared.