Is there any light down there? Would they have eyes? Stars etc. might be more like totally abstract theoretical concepts like quantum physics is to us, or at l

Is there any light down there? Would they have eyes? Stars etc. might be more like totally abstract theoretical concepts like quantum physics is to us, or at least X-rays. They might not be able to literally look up and see things, having mostly only sonar, hearing, and touch senses; handfuls of surface-explorers wearing special environment suits report the utterly strange sensation that space seems almost totally two-dimensional on the surface and there seems to be total emptiness above. Except that heat sometimes seems to be coming from above in strange repeating patterns. OTOH they might wonder how a species like us could possibly survive, being unable to see through our own bodies using sonar it must be extremely difficult to develop internal medicine. We would probably just get wiped out by some disease early on.