After 20 or 30 feet you come to a T-junction. Take a left.

5 seconds sound clip from the Jurassic Park (1993) movie soundboard.

You can hear this line at 01:39:37 in the Blu-ray version of the movie.

Quote context

[...]

- Go. Now!

- Mr. Arnold? Mr. Arnold?

- John, I'm in. Great.

- Ahead of you is a metal staircase. Go down it.

- Okay. Going down.

- After 20 or 30 feet you come to a T-junction. Take a left.

- Have her follow the main cable.

- I know how to read a schematic.

(JURASSIC PARK SOUNDSCAPE)

- I guess that means the power's off.

[...]