Better Swimming

This mod is for Fabric only.

What is this mod?
Better Swimming offers a subtle quality-of-life improvement to the water mechanics of vanilla Minecraft. Water blocks now allow light to pass through fully, causing the ocean floor to be illuminated by sunlight during the day; and several other base swimming mechanics have been improved to make being underwater more enjoyable.

Better oxygen system

• Longer breaths - 80 seconds instead of the original 15 seconds (1600 ticks instead of 300 ticks)

Drowning is similar to Subnautica'a system:

• As you near drowning the screen slowly fades to black over the course of 5 seconds
• Once the screen is completely black you still have 4 seconds before you will actually drown
• Drowning is instant death instead of the usual 2 damage at a time

More responsive and easier-to-control swimming

• No passive sinking - your character automatically treads water for you
• Wading has a speed buff, so it's the same as walking on land
• Swimming (sprinting underwater) is also about the same speed as sprinting on land
  
  

Easier to mine underwater

• No mining penalty for being underwater (and, as a side effect, no penalty for mining while jumping/falling in air)

Nicer to look at

• Water no longer subtracts light levels, so ocean beds will be illuminated from sunlight during the day

Screenshots were taken with the Complementary v4 shader.
This is my first published mod so fingers-crossed it works well.