This is no legend, as you'll soon see for yourself.

3 seconds sound clip from the Creature from the Black Lagoon (1954) movie soundboard.

You can hear this line at 00:40:28.101 in the Blu-ray version of the movie.

Quote context

[...]

- I've got the proof here in my lens.

- Many years ago, I hear this legend on the river. A very old native tell me of a man who live underwater, but she was crazy.

- Crazy Goole, everybody called her.

- The unknown always seems unbelievable, Lucas.

- One accepts these things as legend and lets it go at that, but to actually believe that there exists something like a human being that can live underwater...

- This is no legend, as you'll soon see for yourself.

- What about the kamongo? Science hadn't heard about it until a few years ago. The kamongo lived way back in the Devonian age.

- Interesting that the fossil I found was out of the same period.

- The kamongo was a fish that breathed air.

- What does that prove?

- Nothing. Except that the kamongo fish, which has lungs, exists today, right here in the Amazon. It hasn't changed in all these millions of years.

- That doesn't prove the possibility of a gill-man.

[...]