World’s Greatest Shipwrecks (2021)

S1E4 Assassins of the Deep

The remains of three German U-boats, including UC-66—the first ever downed by an aircraft during WW1—and U480, which holds the title of the world’s first stealth submarine, are slowly disintegrating on the ocean floor. Alongside them, the tales of their tragic ends are fading away. A dedicated group of maritime archaeologists is determined to uncover the whereabouts of these submarines and unravel the mysteries surrounding their catastrophic fates.