NCIS: Los Angeles: Deep Trouble, Part

SYNOPSIS

The crime drama returns. Sam and Callen are stranded aboard a submarine that has been rigged to explode by terrorists, and the duo must draw upon all of their experience to put a stop to the criminals' plans. With Kensi and Deeks unable to contact the pair, their hopes could rest on the intervention of Hetty, who skips her hearing in Washington, DC, after learning about their plight. Starring Chris O'Donnell and LL Cool J.