Dialogue Reads:

Haddock: Me, drink Seawater, you haven’t fallen on your head have you?

Tintin: Try it Captain, it’s not so bad.

For context, they’re traveling to Mecca, which would likely place them in the Red Sea, one of the most saline bodies of water in the world.

Nothing can kill Tintin, not even his own stupidity or deathwish.