This is the modpack used by branzy in his video, im not trying to take credit or anything but here are all the mods plus a few extra to keep it more stable and from crashing.
To get the realistic ocean he used, you have to pay an extra 5 dollars for the physics mod.
https://minecraftphysicsmod.com
Edit: Thank you so much for 5k downloads
The Branzy's pirate Team
