What is the fine-grained topic of the following text: for that malicious reprobate, having often endeavoured in vain to persuade both the captains that I might be thrown into the sea (which they would not yield to, after the promise made me that I should not die), however, prevailed so far, as to have a punishment inflicted on me, worse, in all human appearance, than death itself. Only return the topic.
Punishment of a maligned individual at sea.