The description of the ichthyosaurus during the fight between it and the plesiosaurus paints a very vivid picture in
my head. With phrases such as, "eye... as big as a man's head.", "has the whale's speed and size", "jaws...
not less than 182 teeth".
Right when Axel discovers the secret of the parchment it is quite visible that something out of the ordinary is happening.
This thought is confirmed when Axel swears that he won't show the secret to his uncle; however by this time his uncle has
already re-entered the room.
The theme for this book is exploration, which is typical of a Jules Verne novel. People
could consider that another theme for this book is that humans triumph over nature.