Panel 2 is an allusion to one of the - from a modern standpoint - more bizarre parts in Jules Verne's novel:
In Chapter 12, the Nautilus meets a school of baleen whales, and Ned Land (the real Ned Land) asks Captain Nemo if he can hunt them. But Nemo objects to this, and explains that whaling is reprehensible and drives this animals to the brink of extinction.
Just as the modern day reader is thinking that this is a remarkably progressive attitude for the 19th century, a school of sperm whales appears. The novel claims that these are the predators of the baleen whales. (AFAIK, today this is not the scientific consensus anymore.) So how does Nemo react? Does he say that it's just the course of nature if the sperm whales start to attack the baleen whales? No! He uses the Nautilus for massacring all these "evil" sperm whales!
Ah yes, that bit that makes sure the reader does not like Captain Nemo. Up to that point he seems like a pretty amazing guy apart from his one huge grudge, but then suddenly, massacre!
I can't help but think "dear God, it's coming right for us!"
I will try to do better with my references from here on out. :)