HMM... there is no oxygen in the bunker so that rules out combustion for a light source... will return later with less obvious solution.
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*some time later*
Possible non-combusion light sources:
Oh thank you indians for your complex ceremonies! And Wikipedia for catalouging what I doubtlessly would have considered useless information before!
So heres what I found, The Ute People (
http://en.wikipedia.org/wiki/Ute_Tribe) have this buffalo rawhide rattle, filled with quartz crystals, and when shaken the rattle gives off light because of the mechanical stress the quartz crystals are subjected to. Better yet Quartz is found in a cyrastaline form natrually and is the second most abundant matieral on the Earth's crust
! Now the hide of the buffalo is just thin enough to allow the light to shine through, with dog leather being thiner than Buffalo hide we can make the rattle out of dog leather and use it to light our way. Just have a small piece of wood attached to a leather sack containing quartz and swing it around, so simple you could have one of the children do it (not literally though, do we even have children? we haven't even been here 9 months right?).
Now all we have to do to get this light source is have 5 scientists go and find some quartz, it doesn't weather so it can be found near rivers, where most other stone would have eroded into sand or basic soil, so have those sceintists look by the river valley, have them accompeny the soldiers on the water run. When they get back have them construct the rattle.
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I never thought that the succes of rebuilding ciilization would rest on a rattle.
* it took like 2 minutes to get those lines to work, so counter initutive.