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.

The Top 12 artists perform live for the first time in front of Coaches Chance the Rapper, Dan + Shay, John Legend and Reba McEntire for their spot in the Live Semi-Final. Viewers have the chance to vote for their favorite artist overnight.