Didn't the robots have some sort of night vision in the previous chapter?
First you walk a few metres into the tunnel to test your night vision:60: Take out the glowing gem thingy and see if that creates enough light to continue (maybe walk in a few meters just to lessen the outside light?)

Taruka: Hey, what are you doing in there?
60: Just testing something.
Then you take out your glowing gem thingy:

So, you want to go in with light, or not?