Mine

function main()
  use()
  setup()
  goOneDown()
  setup()
  goOneDown()
  turtle.turnLeft()
  turtle.turnLeft()
  turtle.up()
  turtle.select(14)
  turtle.place()
  turtle.down()
  turtle.turnLeft()
  turtle.turnLeft()
  turtle.select(1)
  local torches = turtle.getItemCount(16)
  for i=1, torches do
    for j=1, 5 do
      setup()
      if goOneDown() then
        return true
      end
    end
    placeTorch()
  end
end

function use()
  print("64 Torches on Itemslot 16")
  print("64 Cobblestone on Itemslot 15")
  print("2 Craftingtable on Itemslot 14")
end

function placeTorch()
    turtle.up()
    turtle.turnLeft()
    turtle.turnLeft()
    turtle.forward()
    turtle.up()
    turtle.select(16)
    if turtle.compareUp() then
        return 'true'
    end
    turtle.placeUp()
    turtle.turnRight()
    turtle.turnRight()
    turtle.down()
    turtle.forward()
    turtle.down()
end


function setup()
  while turtle.detect() do
    turtle.dig()
    sleep(0.5)
  end
  turtle.forward()
end

function goOneDown()
  while turtle.detectUp() do
    turtle.digUp()
    sleep(0.5)
  end
  if turtle.detectDown() then
    turtle.digDown()
    if turtle.detectDown() then
      print("Block unbreakable")
      return true
    end
  end
  turtle.down()
  if turtle.detectDown() then
    turtle.digDown()
    if turtle.detectDown() then
      print("Block unbreakable")
      return true
    end
  end
  turtle.down()
  if turtle.detectDown() then else
    turtle.select(15)
    turtle.placeDown()
    turtle.select(1)
  end
  turtle.up()
  return false
end

function goBack()
  turtle.turnLeft()
  turtle.turnLeft()
  turtle.forward()
  turtle.select(14)
  while true do
    turtle.up()
    if turtle.compareUp() then
      return true
    else
      turtle.forward()
    end
  end
end

main()
print("End Going Up")
goBack()
print("Finished")