Here is a little part of the submarine attached to the boat! There is redstone commands and a lot of fun stuff to explore! There are 3 boats/rafts and more cool details. Please leave a comment if you like it!
I really do hope you do enjoy this map!

To download:

1. do %appdata%
2. Go into your .minecraft folder
3. Go in your saves
4. Put it in your saves file and you can have fun exploring the boat!