Roblox Script Generated by ScripterAI

"instead of making the script.parent.bar visible false or true, depending on if its false or true make the bar transparency fade out or in corresponding to false or true. when transparency is 0 or 1 then make it false or true then reset the transparency so it can be used repeatedly. use tween service"

local Character = game.Players.LocalPlayer.Character
local Humanoid = Character:WaitForChild("Humanoid")
local Bar = script.Parent.Bar.Bar
local CurrentOxygen = 100
local cooldown = 0.3
local Swimming = false
local TweenService = game:GetService("TweenService")

local tweenInfo = TweenInfo.new(
	1, -- Time
	Enum.EasingStyle.Linear, -- EasingStyle
	Enum.EasingDirection.InOut, -- EasingDirection
	-1, -- RepeatCount (infinite)
	true, -- Reverses (tween will reverse once reaching it's goal)
	0 -- DelayTime
)

local transparencyTween = TweenService:Create(script.Parent.Bar, tweenInfo, {Transparency = 1})

Humanoid.StateChanged:Connect(function(oldState, newState)
	if newState == Enum.HumanoidStateType.Swimming then
		Swimming = true
		transparencyTween:Play()
	else
		Swimming = false
		transparencyTween:Reverse()
	end
end)

while wait(cooldown) do
	if Swimming then
		if CurrentOxygen > 0 then
			CurrentOxygen -= 1
		end
	else
		if CurrentOxygen < 100 then
			CurrentOxygen  = 1
		else
			wait(0.3)
			if script.Parent.Bar.Transparency == 1 then
				script.Parent.Bar.Visible = false
				script.Parent.Bar.Transparency = 0
			end
		end
	end
	if CurrentOxygen < 1 then
		Humanoid.Health -= 5
	end
	Bar:TweenSize(UDim2.new(1, 0, CurrentOxygen / 100, 0), "InOut", "Linear", cooldown)
end