'NCIS: Los Angeles' Season 6 premiere on September 29; will Sam and Callen be rescued from submarine trap in time?

"NCIS: Los Angeles" Season 5 had ended with "Deep Trouble," where the characters of actors Chris O'Donnell (G. Callen) and LL Cool J (Sam Hanna) were trapped in a submarine full of explosive gas and a pair of fangerous terrorists. The cliffhanger had led fans wondering whether the upcoming season would be a gamechanger in terms of the dynamics between the two naval agents. LL Cool J even posted on Instagram about it, and shared another photo of a ship that might be used in one of the scenes.