Haha. I would never disown you for getting my submarine wrong. 

 I often use those mistakes to improve the ship. 

 I heartily enjoyed your description. 

Oooooh. Here's a chance to make some fan fiction. I'm going to title this description:
The Beast Within
Don't let the title throw you, though. 

 Let's see if you can guess whom I am describing here:
I had to do it. I could not let him get away this time. Not after so long. I had chased him for over three years. He was mine. Finally. I had him cornered, you see. Which is a very difficult thing. Only Prometheus has ever been able to contain him, and even then barely, so I thought for sure he would escape. But he just stood there. You know, I owed this creature my life. Several times he had saved it. Like that time in Las Vegas. Or that other time in the woods. Though when we were in the forest he was more often man than the beast. John Doe is what I've known him as. Such a gentleman, courteous, strong, and never wanting to give up.
How could I do it? How could I capture this man? I owed him my life. But for years I waited for this moment! I took out my gun, loaded with an animal tranquilizer. My friend. That is what I had called him. "Call me Jack, all my friends do," I had told him. I couldn't capture him. What heartless person would? But he needed help, and so did I. Without this story, without the capture of the creature, I would have been stuck exposing little stories in little towns. Real journalism is what I wanted, and this creature would give me that chance! I cocked the gun and aimed it at the creature.
The creature raised his arms and roared in such an animal way. That's all he was. An animal. This would be easy. But that couldn't be right. I knew this man. My friend. Could I hurt him? Running. He was always running from me. And I was always running. Running towards him. As I grew to understand him, I tried to be less threatening. I tried to tell him that I truly wanted to help him, but he never would let me. Now was my chance to make it up to him. I would save him from his inner creature. I would save him from his beast within. But he may have had some logic to his thinking. Would I not exploit his condition to the world? The National Register is read by all of America. I placed my hand on the trigger.
Perhaps I could write my story in such a way that would give me my break, but protect this man. My friend. John Doe would no longer have to live in fear, and I could stop living in contempt from others. I know John doesn't trust me. It's because of my reputation in my paper. But if only he knew that I hated those exploitations! If only he knew that his story would allow me to write real journalism! I pulled the trigger. 
The dart hit the creature on his massive, green leg. He cried out in pain. It hurt me to see him act like this. Immediately he grabbed my gun and crushed it. He looked me in the eyes, grabbed my jacket, and threw me back. He hit the walls, but failed to break through. The tranquilizer had begun its work. He winced in pain from the dart, then hit the wall again. It frustrated him that he had no way of escape.
The creature sat down facing me and looked as if he was going to cry. He pulled the dart out of his leg, but it was too late. His strength was leaving him. I stood up and walked over to him, looking around the room for a pay phone. Then something happened that I had never seen in all of my years chasing this thing. It's transformation back into John. I had witnessed the initial metamorphosis, but never the return. Slowly the creature's muscles shrank to the size of a normal man's, and the green skin color turned tan. As John blinked his eyes turned back to brown from white. John was almost unconscious due to the drug, but he still attempted to orient himself.
I looked into John's face and then it was I who needed to orient myself. I took a second look, and then tried to speak. How could I have done such a thing? How could I have accused the beast of murder in my column? For here sat whom I had thought was the creature's first victim! How could I have wanted to capture this man. How could I have let my passion take a hold of me. Still, my obsession with this creature prevailed and my curiosity got hold of me. I opened my mouth once again, looking straight at the man, and said, "David, is that you?" The man grew startled and then fell asleep.
OK, so I know this isn't exactly an epic battle, but it sort of is. But I really wanted to do some fan fiction, so I hope this counts. 

 Can y'all guess who all of the characters are? 

The next person will describe... being a cabin boy/girl aboard a ship.