This is not a book to prove or disprove the existence of the Leviathan. I use the Leviathan to create an adventure story. I do not hesitate to write that I really do believe in a huge monster called Leviathan. I believe that there is only one such creature. I have never read or heard a complete description of this creature. Everyone, including Creation Scientists, in my opinion, fail to grasp the uniqueness of this singular creature. Historical Geologists, in general, have attempted to make us believe that the Leviathan is some contemporary animal such as a crocodile. Some more honest individuals dare to suggest that the creature is some leftover prehistoric creature believed to be extinct such as a plesiosaur or an ichthyosaur.
James 3:7 (KJV) says this, "For every kind of beast, and of birds, and of serpents, and all things in the sea, is tamed, and hath been tamed of mankind: " Now, I do not have room here to go into this history. You will have to do the research. My point here is that there is nothing in the oceans so big and bad that mankind can't subdue or tame if he so desires. There is one exception to this reality.
Job was aware of the Leviathan. God did not ask Job if he had read a book about an ancient creature by the name of Leviathan or had gone by a museum. No, the animal was one which Job had some personal knowledge of just like he had some, but not all, personal knowledge of the other animals or scientific questions God asked Job. For those of you who are interested, read Job: 38-41. Behemoth is a monster also contemporary with Leviathan and Job. I did say Job Job 40:15; "Behold now behemoth, which I made with thee..."
I am not going to explain why God asked Job about his knowledge of these creatures, especially Leviathan. Please read Job: Chapter 41; because it will do you good to take time to consider that this monster is something most people cannot even imagine. Job 41:10; "None is so fierce that dare stir him up: who then is able to stand before me?" Job 41:33; "Upon earth there is not his like, who is made without fear."