Well, it was more a declaration that he doesn't belong to anyone, but since you ask.

"I..."

Jack's answer takes a bit too long to arrive. He doesn't want to tell the truth here, but there's a sentiment fighting to get out.

"They're gone."

He's found some more drawers on this side of the room and he opens one, taking his cue from Sinclair. Papers, nonsense, no big sheet with "SUBMARINE THIS WAY" printed on it.

"I don't want to talk about this, mister Sinclair."