SFX: of a giant industrial fan

"Finally made it!"
"Welcome aboard"

P2 is struck by its magnitude.
"Yep its venting exhhaust from the deep tunnels..

P1 brings out a notepad, and makes a paper airplane. P1 eating a sandwhich says, “This exhaust has been on so long that a unique ecosystem has built up around it, if we can prove that then we can try and prevent them from shutting it down”

He then folds the sandwich wrapper into a dart and throws it towards the airstream from the fan, hoping that it would catch the massive updraft. The plane is promptly bent in half and sucked into the edge of the fan.

P2 pauses, carefully makes and throws a plane which is also destroyed, and then says “I shot a man in Reno”

P1 rejoins with “Just to watch him die”, he throws a plane, “you like Johnny Cash?”

P2 says “Not massively, just that song” Another plane is destroyed

P1 says “I hang my head and cry” P2’s paper plane catches the wind,

and disappears over the horizon. They dance and whoop like the kids they are.