What if it's true? is the seventh of thirty-eight cinematics shown in The Last of Us. It is approximately one minute and seventeen seconds long in length. Below is the complete transcription for this cutscene's spoken dialogue.
Note that the dialogue is copied from the subtitles.
Joel: [Looking up.] "Alright they're gone."
Tess: [Crouches beside Ellie.] "Look - what was the plan? Let's say we deliver you to the fireflies, what then?"
Ellie: "Marlene...she said that they have their own little quarantine zone with doctors there still trying to find a cure."
Joel: "Yeah, we've heard that before, huh, Tess?"
Ellie: [Pauses.] "And that..." [scoffs.] "whatever happened to me is the key to finding the vaccine."
Joel: [Annoyed.] "Oh, Jesus."
Ellie: "It's what she said."
Joel: "Oh, I'm sure she did."
Ellie. [Aggressively.] "Hey, fuck you, man!" [Stands up.] "I didn't ask for this."
Joel: "Me neither. Tess, what the hell are we doing here?"
Tess: "What if it's true?"
Joel: [Disbelief.] "I can't believe -" [Turns away.]
Tess: [Follows.] "What if, Joel? I mean we've come this far, let's just finish it."
Joel: [Pulls Tess to the side.] "Do I need to remind you what is out there?"
Tess: [Looks at Ellie and back at Joel. She nods.] "I get it."
[Tess walks off and Ellie glares at Joel as she follows. Joel stands still, and exhales in frustration. End cinematic.]