To a looter, like to a grave robber of an ancient tomb, a thorougly salvaged wreck holds no interest any more. I think that is why the Sleepers let this Talocan frigate just float about. They have extracted everything of any use from it.
However, to the scientist curious about ancient cultures, even a looted wreck is a source of interesting information: We know very little about Talocan culture and writing, and even though the tomb is emptied of valuables, so to speak, there are still frescoes on the wall.
Over the many years that the wreck has been exposed to solar winds and dust clouds, all markings seem to have faded away. However, even a small amount of pigment particles can still be made visible through (even weak) fluorescence rather than reflection or absorption of light. By sending in the right frequency, and monitoring the right frequency, even trace amounts can be made visible.
That is how we see the frescoes on this tomb's walls. I have logged and added the symbols that we found. We do not understand them yet, they look blocky somewhat like Jovian glyphs (and some have posited a relation, although that is controversial). The Talocan language remains a long-standing mystery, and many academic works have been written trying to interpret the icons.
As you can see from the sample in the handbook above, these square pictographs look somewhat similar. There also seem to be too many different ones for them to be letters in an alphabet. We do not know if they break down into such smaller units, or perhaps they are ideograms representing words or concepts, like a pictogram for "emergency exit hatch".
However, the more different ones we can add (including the context where they were found), the larger the body of knowledge about them grows and perhaps one day we have enough information to crack the code of the Talocan language!
((ooc picture credit: Archaeological Museum of Zagreb; page of the Oedipus Aegyptiacus of Athanasius Kircher))
