528 00:45:37,960 --&amp;gt; 00:45:42,680 it's a six inch steel pipe and we're going to bolt them together 529 00:45:42,680 --&amp;gt; 00:45:45,040 in one big tube, 40 metres long 530 00:45:45,040 --&amp;gt; 00:45:46,680 and do that five different times 531 00:45:46,680 --&amp;gt; 00:45:49,760 and the laser light's going to go down the centre of the tube.