DigTunnel

function moveLeft(blocks)
    turtle.turnLeft()
    for i=1,blocks do
        turtle.forward()
    end
    turtle.turnRight()
end

function moveRight(blocks)
    turtle.turnRight()
    for i=1,blocks do
        turtle.forward()
    end
    turtle.turnLeft()
end

function moveUp(blocks)
    for i=1,blocks do
        turtle.up()
    end
end

function moveDown(blocks)
    for i=1,blocks do
        turtle.down()
    end
end

function moveForward(blocks)
    for i=1,blocks do
        turtle.forward()
    end
end

function moveSafely()
    while(turtle.detect()) do
        turtle.dig()
    end
    turtle.forward()
end

function digForward(blocks)
    for i=1,blocks do
        turtle.dig()
        moveLeft(1)
    end
    moveRight(blocks)
end

function digDown(blocks)
    for i=1,blocks do
        turtle.digDown()
        moveLeft(1)
    end
    moveRight(blocks)
end

function digUp(blocks)
    for i=1,blocks do
        turtle.digUp()
        moveLeft(1)
    end
    moveRight(blocks)
end

function main(amount)
    print(amount)
    for i=1,amount,1 do
        digDown(2)
        moveDown(1)
        digForward(2)
        moveSafely()
        digUp(2)
        moveUp(1)
        digUp(2)
        moveDown(2)
    end
end

print("amount:")
local amount = tonumber(read())
main(amount)