NCIS S21E10 Reef Madness

NCIS 21x10 "Reef Madness" Season 21 Episode 10 Promo (Season Finale) - Parker and Knight discover three bodies on an old Navy ship that's about to be sunk and turned into an artificial reef, when they're suddenly locked inside by a mysterious figure.

Also, Vance offers Knight a unique opportunity, on the 21st season finale.