There he goes now into the Tunnel of Love, so we have to go into the tunnel after him.
4 seconds sound clip from Scooby-Doo, Where Are You! - Foul Play in Funland (S1E8).
You can hear this line at 00:10:00.429 in the Blu-ray version of the episode.
Quote context
[...]
- Come on, everybody. After him!
- Help! Shaggy, he's got me! Yow!
- Yow! Let go! Let go! He got me! He got me! Help!
- There he goes now into the Tunnel of Love, so we have to go into the tunnel after him.
- Row faster! We can catch him!
- There's something in that tunnel! It's him! He's swimming right at us!
- I thought we wanted to catch him.
- Like a torpedo, he's going to ram us!
- Thanks, Shaggy, but why don't we just walk out?
- That's no ordinary man. He's going to be hard to track down.
[...]