Through the ventilating system?

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

You can hear this line at 00:18:50 in the Blu-ray version of the movie.

Quote context

[...]

- I am the Prince of Puzzlers, the Count of Conundrums, the King of Crime. My whole court here, no one else...

- It's a good idea hiding the Batmobile on that thicket. Nobody will spot it there.

- I hope nobody spots us climbing this wall.

- Why don't we just break in through the main entrance? Surprise attack style.

- Don't worry, we'll catch them off guard.

- Through the ventilating system?

- First, I wanna make sure we don't endanger King Boris when we make our entrance.

- Gosh! There could be diplomatic repercussions if we fail this time, Batman.

- That's not the point. What's important is that the world knows that all visitors to these teeming shores are safe, be it a peasant or a king.

- Gee, Batman, I never thought of that. You're right.

[...]