That ends any chance of tracking him with the homing device. Shall we after him in the manhole?

7 seconds sound clip from Batman (1966) - A Riddle a Day Keeps the Riddler Away (S1E11) TV Series.

You can hear this line at 00:10:16 in the Blu-ray version of the movie.

Quote context

[...]

- Holy sewer pipe! What's he up to?

- You're slipping, Batman.

- I knew it was a phony crown all the time.

- Riddle me this, crime fighter. What room can no one enter?

- If you figure it out, look for another royal riddle in this crown.

- That ends any chance of tracking him with the homing device. Shall we after him in the manhole?

- We'll never find him. There're hundreds of tunnels down here.

- A riddle a day keeps The Riddler away.

- What?

- Once, a long time ago, The Riddler made the mistake of telling me that. It means as long as he dishes out riddles, he's... He's not finished with his plot.

[...]