My second theory would be that the spider was tired of being observed like some sort of arachnoid specimen (his name was Charles dammit!) by snot nosed kids from a now distance planet. Upon committing suicide he was tossed into the latrine by his spider wife (Sofia) so that he would be washed out into space via the latrine ejection portal, per his wishes - which he made clear in his last, seemingly entangled suicidal web spun. It is possible that his suicide note of a web is indeed, a farewell 3D masterpiece.
I can't read spider web, can you? You would think if anyone could, rocket scientists would be able to. Perhaps once the "experiment" is brought home for analysis, the true story of the spider's humiliation and last moments will be unraveled from a raveled 3D web.