What's with this dream?

I had a very strange dream last night. It's stuck in my head and I can't stop thinking about it. It started on a ferry, a specific ferry, local to me. We sat at the back, inside. I had someone with me, but I can't remember who. The weather was rough and the ferry was rocking for most of the time. A young girl came to sit with us. She was about 10. A little blonde girl. She looked vulnerable and innocent. She was scared. The boat started to flip and turn, somersaulting through the water. It was like a roller-coaster with no safety harness. The girl was too small to hold herself in her seat. I picked her up and held her on my lap. The boat continued to roll, but we were not hurt. When the rolling stopped, the whole boat was lifted into the air, level to a platform. Like a jetty or pontoon, but it was suspended high in the air on a metal frame structure. We were told to jump from the ferry onto the platform, maybe 5 feet in distance. Everybody jumped, except me and the girl. She couldn't jump. She said she wouldn't make it and she couldn't swim. I told her I would jump and catch her from the other side. It wasn't far. I told her to trust me, I'd catch her. I did. I grabbed her arm, but her foot slipped on the edge of the platform. I found myself with my cheek to the platform, with the young girl dangling from one arm. Our weight was pulling me over the edge, I had nothing to grip. We fell a long distance into the water. The water wasn't cold. I surfaced, but I couldn't see her. I went under and found her almost instantly. She was conscious and okay. I put her arms round my neck and swam to the metal structure. I held on and a helicopter came, it lowered a chairlift into the water. The kind from ski slopes. I grabbed it, but they started to lift off. We weren't in the seat, we would be dangling again. They put us back in the water and we both got seated. The safety bar wouldn't secure. I put my belt round her and tied her to the chairlift. The chairlift opened and I fell. I pulled myself to the structure and began to climb. As I got near to the top, there was nowhere to go. I fell a third time. When I hit the water, I couldn't swim anymore. I was tired. My clothes were soaked. I was too heavy. This was the point where I woke up. I don't think I've ever had a dream that I remembered so clearly. As soon as I woke up, I had to write it down. It may not sound like a hugely intense dream, but it felt real. It has me quite unsettled. I'm not a spiritual person and this kind of thing doesn't normally affect me. Thoughts?