Sallah: Indy, why does the floor move?
Indiana: Give me your torch. [He drops it in and sees why.] Snakes. Why'd it have to be snakes?
Sallah: Asps. Very dangerous. You go first.
Indy: There's a big snake in the plane!
Jack: Oh, that's just my pet snake Reggie.
Indy: I hate snakes, Jack! I HATE 'EM!
Jack: Oh, come on! Show a little backbone, will ya?
Belloq: Jones, do you realise what the ark is? It's a transmitter! It's radio for speaking to God, and it's within my reach!
Indiana: You wanna talk to God? Let's go see Him together. I've got nothing better to do.
Belloq: You and I are very much alike. Archeology is our religion, yet we have both fallen from the pure faith. Our methods have not differed as much as you pretend. I am but a shadowy reflection of you. It would take only a nudge to make you like me. To push you out of the light.
Indiana: Now you're getting nasty.
Sallah: Indy, there is something that troubles me.
Indiana: What is it?
Sallah: The Ark. If it is there, at Tanis, then it is something that man was not meant to disturb. Death has always surrounded it. It is not of this earth.
Belloq: How odd that it should end this way for us after so many stimulating encounters. I almost regret it. Where shall I find a new adversary so close to my own level?
Indiana: Try the local sewer.
Marion: I'll tell you everything!
Toht: Yes. I know you will.
Toht: Shoot them. Shoot them both.
Toht: Now, what shall we talk about?
Answer: The scene you describe was indeed filmed. It was cut out of the US release of the film although I cannot speak for the Australian version. The scene also appears in the Marvel Comics adaptation. http://www.theraider.net/films/raiders/deleted_scenes.php has a list of this and the other deleted scenes.
Phil C.