When the player walks into a kelp block, the player falls through it as if in air
Squids fall through kelp
When going through kelp underwater while sprinting makes player go back to standing form and then turns back to swimming form when passed the obstacle.
You can jump in underwater plants like jumping on land.
kelp can kill you
Items fall when in hacked water
Fishing rod bobber falls down into the sea grass, kelp, coral and waterlogged block