Trying to make a shovel that digs out terrain?

I'm attempting to make a game based on the Eastern Front, so I'm making a shovel that will allow you to dig out trenches, foxholes, ditches, etc. However, my code is not working.

The explosion just keeps inserting at the center of the map, and nowhere else.

Please Help!

Client Script:

local plr = game.Players.LocalPlayer
local mouse = plr:GetMouse()

local mouseHit = mouse.Hit.p

script.Parent.Activated:Connect(function()
    game.ReplicatedStorage.DigTerrain:FireServer(mouseHit)
end)

Server Script:

--/ Explosion Variables \--
local ex = Instance.new("Explosion")
ex.ExplosionType = Enum.ExplosionType.Craters
ex.BlastPressure = 100
ex.DestroyJointRadiusPercent = 0
ex.Visible = false
ex.BlastRadius = 10
local debounce = false

--/ Main Function \--
game.ReplicatedStorage.DigTerrain.OnServerEvent:Connect(function(plr, mouseTarget)
    if debounce == false then
        debounce = true
        local exClone = ex:Clone()

        exClone.Position = mouseTarget
        exClone.Parent = workspace
        wait(0.5)
        debounce = false
    end
end)