New Delhi, Nov. 2 -- A popular UFO-reporting app, Enigma, has reportedly logged thousands of mysterious underwater sightings-dubbed Unidentified Submersible Objects (USOs)-raising national security concerns among experts.

According to Marine Technology News, the app has received reports of over 30,000 unidentified aerial and anomalous phenomena since its launch in late 2022. Of these, more than 9,000 sightings occurred within 10 miles of US shorelines or major bodies of water, with over 500 within five miles.

"Any object detected underwater that cannot be immediately identified or explained" qualifies as a USO, according to Enigma.

California and Florida have emerged as the top two hotspots for USO activity, logging 389 and 306 reports...