excavate

-- Get dimensions of box
print("How much in front of me do you want to clear out?")
local z = read()
print("How much horizontal space?")
local x = read()
print("How much vertical space?")
local y = read()

-- Functions
local function fwd()
    while not turtle.forward() do
        turtle.dig()
    end
end

local function moveUp()
    while not turtle.up() do
        turtle.digUp()
    end
end

local function moveDown()
    while not turtle.down() do
        turtle.digDown()
    end
end

local function clearRow()
    turtle.turnRight()
    for i = 1, x - 1 do
        fwd()
    end
    turtle.turnRight()
    turtle.turnRight()
    for i = 1, x - 1 do
        fwd()
    end
    turtle.turnRight()
end

local function clearFace()
    clearRow()
    for i = 1, y - 1 do
        moveUp()
        clearRow()
    end
    for i = 1, y - 1 do
        moveDown()
    end
end

local function clearAll()
    for i = 1, z do
        fwd()
        clearFace()
    end
    -- return to start
end

clearAll()

for i = 1, z do
    turtle.back()
end