The US military is investing heavily in unmanned naval systems, including underwater and surface vessels, as it seeks cheaper ways to monitor vast areas of ocean, gather intelligence, and track adversary ships and submarines In response to Iranian claims of the capture, a Pentagon spokesperson said a US underwater drone had "malfunctioned more than a day ago." Key points and original sources are listed below.

• The US military is investing heavily in unmanned naval systems, including underwater and surface vessels, as it seeks cheaper ways to monitor vast areas of ocean, gather intelligence, and track adversary ships and submarinesS1

• In response to Iranian claims of the capture, a Pentagon spokesperson said a US underwater drone had "malfunctioned more than a day ago."S2

• Iran’s Revolutionary Guards said on Tuesday it had captured a ‌US uncrewed submarine at the entrance to the Strait of Hormuz, offering a rare glimpse into how underwater drones are being used in military operations. Iranian state media said the vessel was a Di...S3

• Iran said Tuesday it captured a U.S. uncrewed submarine in the Strait of Hormuz. The Pentagon said it had malfunctioned more than a day ago.S4

• WASHINGTON, Sept 8 (Reuters) - Iran's Revolutionary Guards said on Tuesday it had captured a U.S. uncrewed submarine at the entrance to the Strait of Hormuz, offering a rare glimpse into how underwater drones are being used in military operations.S5