He's swimming. He's swimming. He's giving it all he's got and then three gigantic sharks captured him.
7 seconds sound clip from the Finding Nemo movie soundboard.
You can hear this line at 00:59:49 in the Blu-ray version of the movie.
Quote context
[...]
- What was his name? Some sort of sport fish or something. Tuna? A Trout?
- Marlin?
- That's it. Marlin. The little clownfish from the reef.
- It's my dad! He took on a shark!
- That's got to be 4,800 teeth!
- You see kid. After you were taken by Diver Dan, your dad followed the boat all over like a maniac.
- Really?
- He blows 'em up and then dives thousands of feet and gets chased by a monster with huge teeth!
- He was looking for you after all, Sharkbait.
- He's swimming in the filter!
[...]