Yes. The gunwale and keel are definitely safe.
3 seconds sound clip from the Muppet Treasure Island movie soundboard.
You can hear this line at 01:12:07.707 in the Blu-ray version of the movie.
Quote context
[...]
- Oh, you are a good man. You are a kind man. A handsome man.
- Oh, he's... You're precious and...
- Oh, no!
- Well, that won't help us. We're gonna have to swim to the ship.
- Swimming to a ship that's full of killer pirates to save the Captain is not a good plan.
- Look!
- Yes. The gunwale and keel are definitely safe.
- Mr. Arrow! It's me! Jim! Mr. Arrow, over here!
- Oh. Oh, boys. Come join me aboard this exceptionally safe little boat. Hmm.
- By the way, that Silver fellow may not be trustworthy.
- Yeah.
- And here's a photo opportunity you will not want to miss.
[...]