How Do I Set The Transparency Of The Parts Inside A Model To 1?

Iv'e begun creating a mine but I don't want to destroy the model straight after its stood one, I want to let the sound finish playing before I Destroy the mine. I thought of making the parts transparent until the sound is finished and then destroying the model as a whole.

local de = false -- Debounce

local mine = script.Parent.Parent -- Defining the model

local descendants = mine:GetDescendants() -- I could use GetChildren

script.Parent.Touched:Connect(function(hit)
	local h = hit.Parent:FindFirstChild("Humanoid")
	if h ~= nil and de == false then
		de = true
		local e = Instance.new("Explosion")
		e.Parent = script.Parent
		e.Position = script.Parent.Position
		script.Explosion:Play()
		for i=1,#descendants do
			local descendant = descendants[i]
			if descendant:IsA("BasePart") then
				descendant.Transparency = 1	
		wait(3.4)
		script.Parent.Parent:Destroy()
		end
	end
end

Any help would be appreciated

use loops like

this

for i, v in pairs(game.Workspace.Model:GetChildren()) do
         -- your code
end