A special class of highly valuable stealth resources have been placed at a resource drop-off point. Instructions state they have been placed in blue tunnels, but remain hidden until up-close to avoid detection by alien forces. Collect them all.
The easiest way to solve this level is to go row-by-row, going through each of the blue tunnels, starting with the bottom row and working your way up. There are several empty blue tunnels, but to avoid having to memorize the locations go through all of them. For your reference, the tunnels containing a resource are shown in the image to the right.