The Three men's lives were saved as they were held above water by the monster which they discover to be a modern submarine, named the Nautilus, as they climb inside they come upon the submarines captain and his crew, his name is Captain Nemo (as i recall).
The underlined words are a metaphor as they compare Fredo to a creature without using like or as.
Answer:
It is harmful because it has a very strong smell that could mess with your breathing
Explanation: