MineTunnel

lenght = 196
fuelSlot = 1
buildSlot = 2
cobbleSlot = buildSlot
y = 0
level = 0
turnBuild = "turn"

function refuel()
    turtle.select(fuelSlot)
    if turtle.getFuelLevel() < 1 then
        turtle.refuel(1)
        print("Refueled")
    end
end

function height()
    refuel()
    if level == 0 then
        while turtle.detectUp() == true do
            turtle.digUp()
        end
        turtle.Up()
        level = 1
    else
        while turtle.detectDown() == true do
            turtle.digDown()
        end
        turtle.Down()
        level = 0
    end
end

function build()
    if level == 0 then
        turtle.buildDown()
    else
        turtle.buildUp()
    end
end

function move()
    refuel()
    while turtle.detect() == true do
        turtle.dig()
    end
    turtle.forward()
end

function seal()
    turtle.turnLeft()
    turtle.build()
    turtle.turnRight()
    build()
    turtle.turnRight()
    turtle.build()
    height()
    turtle.build()
    turtle.turnLeft()
    build()
    turtle.turnLeft()
    turtle.build()
    turtle.turnRight()
    move()
end


function cobble()
    for slot = buildSlot, buildSlot + 3, 1 do
        if turtle.getSlotCount(slot) > 6 then
            cobbleSlot = slot
        else
            print("Low on cobble")
            cobbleSlot = buildSlot
        end
    end
end
--~Start of run

move()
y = y + 1
for y, length, 1 do
    seal()
end

for i = 0, 2, 1 do
    height()
    level = 0
end
turtle.turnRight()
turtle.turnRight()
move()
y = y - 1
for y, 0, -1 do
    seal()
end
for i = 0, 2, 1 do
    height()
    level = 1
end
turtle.turnRight()
turtle.turnRight()
print("Finished")