konnichiwater

local WaterDict = game.Workspace.WaterFolder:GetChildren()
local Torso = script.Parent:WaitForChild("Torso")
local ShouldUpdateMass = true
local Mass = 0
local WorldGravity = 196.2
local WaterGravity = WorldGravity / 4
local GravityForce = Instance.new("BodyForce", Torso)
local UnderWaterEffect = game:GetService("Lighting"):WaitForChild("UnderWaterEffect")
local UnderWaterSwampEffect = game:GetService("Lighting"):WaitForChild("UnderWaterSwampEffect")
local UnderLavaEffect = game:GetService("Lighting"):WaitForChild("UnderLavaEffect")
local UnderWaterSoundEffects = {}
for _, Effect in pairs(game:GetService("SoundService"):WaitForChild("Music"):GetChildren()) do
	if Effect.Name == "UnderWaterEffect" then
		table.insert(UnderWaterSoundEffects, Effect)
	end
end
local Camera = game:GetService("Workspace").CurrentCamera
function GetCharacterMass()
	local CharacterMass = 0
	for _, Inst in pairs(script.Parent:GetDescendants()) do
		if Inst:IsA("BasePart") then
			CharacterMass = CharacterMass + Inst:GetMass()
		end
	end
	return CharacterMass
end
function IsUnderWater(X, Y, Z)
	if Y <= 17.5 and Y >= -43 then return true, "Normal" end        -- ocean btw
	for _, i in pairs(WaterDict) do
		if X>i.Position.X-(i.Size.X/2) and X<i.Position.X+(i.Size.X/2) and Y>i.Position.Y-(i.Size.Y/2) and Y<i.Position.Y+(i.Size.Y/2) and Z>i.Position.Z-(i.Size.Z/2) and Z<i.Position.Z+(i.Size.Z/2) then
			return true, i.Biome.Value
		end
	end
	return false, "None"
end
game:GetService("RunService").Heartbeat:Connect(function()
	if ShouldUpdateMass then Mass = GetCharacterMass() end
	local UnderWater, WaterType = IsUnderWater(Torso.Position.X, Torso.Position.Y, Torso.Position.Z)
	GravityForce.Force = Vector3.new(0, UnderWater and ((Mass * WorldGravity) - (Mass * WaterGravity)) or 0, 0)
	for _, Effect in pairs(UnderWaterSoundEffects) do
		Effect.Enabled = UnderWater
	end
end)
game:GetService("RunService").RenderStepped:Connect(function()
	local UnderWater, WaterType = IsUnderWater(Camera.CFrame.X, Camera.CFrame.Y, Camera.CFrame.Z)
	UnderLavaEffect.Enabled = UnderWater and WaterType == "Lava"
	UnderWaterEffect.Enabled = UnderWater and WaterType == "Normal"
	UnderWaterSwampEffect.Enabled = UnderWater and WaterType == "Swamp"
end)
script.Parent.DescendantAdded:Connect(function() ShouldUpdateMass = true end)