Explanation:
* Malapropism: The sailor used the word "sunk" instead of "sunken", which is a common mistake and creates a humorous effect.
* Sentence structure: The sentence highlights the malapropism by including the correction, making it clear that the speaker is aware of the mistake.
* Context: The sentence uses the word "treacherous" as a way to further emphasize the humor of the mistake, as it's associated with danger and potential sinking.
This sentence showcases a common malapropism, which is a type of verbal blunder where a word is used incorrectly, often with humorous results.