mine

for b=1,10 do

for a=1,30 do
turtle.dig()
turtle.dig()
turtle.dig()
turtle.digUp()
turtle.forward()
end

turtle.turnRight()
turtle.dig()
turtle.dig()
turtle.dig()
turtle.digUp()
turtle.forward()
turtle.turnRight()

for c=1,30 do
turtle.dig()
turtle.dig()
turtle.dig()
turtle.digUp()
turtle.forward()
end

turtle.turnLeft()
turtle.dig()
turtle.dig()
turtle.dig()
turtle.digUp()
turtle.forward()
turtle.turnLeft()

end