Lucas: I can tell you something about this place. The boys around here call it "The Black Lagoon" - a paradise. Only they say nobody has ever come back to prove it.
Lucas: What kind of fishing is that? Who eats rocks?
Carl Maia: I eat rocks, in a manner of speaking. I crush and look inside them and they tell me things.
Lucas: What do they tell you?
Carl Maia: How old they are.
David Reed: We didn't come here to fight monsters. We're not equipped for it.
Kay Lawrence: And I thought the Mississippi was something.
Mark Williams: Come on, come on!
David Reed: You talking to me, Mark, or something out there?
Mark Williams: Both, David. They won't believe it back home, none of them. I wouldn't have believed it myself, sitting out here waiting for some monster to appear. That's why we've got to take him.
David Reed: Why won't they believe, Mark?
Mark Williams: Because we deal with known quantities, with knowledge we've accumulated up to now.
David Reed: We've just begun to learn about the water and its secrets, just as we've only touched on outer space. We don't entirely rule out the possibility that there might be some form of life on another planet, and why not some entirely different form of life in a world we already know is inhabited by millions of living creatures?
Mark Williams: We must have the proof!
Lucas: There are many strange legends in the Amazon. Even I, Lucas, have heard the legend of a man-fish.
Carl Maia: Well, now we have a lab, such as it is.
David Reed: Let's hope we have some use for it.
Mark Williams: I'll be disappointed if we don't. Assuming, of course, Dr. Maia's facts are well-founded.
David Reed: Dr. Maia's a scientist, not a fortune-teller! How can he guarantee anything?
Kay Lawrence: Well, it seems to me a scientist has need for both vision and confidence.
Mark Williams: I didn't mean it as any personal criticism, Doctor, it's just that I also look forward to success.