Nell updates Sam and Callen with intel about the case.

Nell approaches Sam and Callen with information about the investigation.

Sam, Callen, Deeks and Kensi walk down the stairs in a line.

Callen looks inside the sub, while Sam covers him.

Sam and Callen are on location on the NCIS: LA season 5 finale.

Sam and Callen on the dock during the Season 5 finale, "Deep Trouble."

Sam and Callen find a submarine being used to transport drugs.