It could be, but there's only one way to find out. Let's go inside.
4 seconds sound clip from Scooby-Doo, Where Are You! - A Clue for Scooby Doo (S1E2).
You can hear this line at 00:13:54.067 in the Blu-ray version of the episode.
Quote context
[...]
- Hey, Scooby, there's nothing to be afraid of.
- Like, wow! What a spooky place.
- It's a perfect home for that seagoing ghost.
- OK.
- Look! What's that? Could that be Captain Cutler?
- It could be, but there's only one way to find out. Let's go inside.
- No. Look at that old-fashioned diving suit. He's been down here a hundred years.
- Scooby-Doo? Scooby-Doo, where are you?
[...]