Little is known concerning Plane #52; its existence was established 26/09/2020 following the discovery of three human remains three meters away from the entrance in Plane #445. Each presented a different stage of decomposition, although all were incomplete, missing limbs or organs which were visibly cut off using crude tools or ripped through brute force. At the time of discovery, the first body was in a state of bloat, the second in a state of active decay, and the last one in a skeletonized state.
The identification of the last body was only made possible with a notebook belonging to Dina A., a courier of the Supplying and Communications Agency containing her experiences in Plane #52, found in a torn apart rucksack along with papers containing instructions for a delivery to Plane #52. There are 57 entries: of those, only forty-three are legible and contain valuable information, with the first entry dated 28/05/1997 and the thirty-third dated 14/04/2009; there are no dates from that point on. The first date is coherent with the courier's recorded departure from Ω and the sudden loss of communication following her arrival at the destination. The last recorded date, however, is inconsistent with the incomplete bleaching of her bones, which suggest the body couldn't have began to decompose a decade ago. The other two corpses have not been identified.
Entrance is carried out through a shallow passage, making movement difficult. Once traveled, the passage leads to a large-sized cavern. Attempting to exit through the entrance is impossible as the mouth of Plane #52 appears to be smaller from within it than outside of it.
Navigation inside the cavern is difficult due to a lack of natural light; usage of an artificial source is therefore necessary. Its length is unknown. Its height is varying, with sections no higher than 2 meters and others much taller. The ceiling features numerous stalactites. The walls have been described as rocky and featuring an earthy color: the currently accepted hypothesis is that Plane #52 is a limestone cave. Reddish-brown crude drawings were consistently seen across all of the walls that were inspected. Some depict three stick figures around a campfire; two of those were crossed-out. Other drawings depict above-threshold prehistoric animals; some suggest a degradation of their author's ability to recall their shapes. Multiple of the drawings also feature a singular stick-figure enclosed inside irregular small shapes. Various hand prints of the same color were also sighted, as well as traces of clawing against the walls. A singular extinguished campfire and crude prehistoric tools were sighted. Food sources are sparse, with only few bugs sighted; their edibility is unconfirmed. Water is also sparse, with droplets occasionally leaking through the ceiling and the stalactites.
The courier's diary contains repeated reports of feeling observed. Mentions of "eyes" increase in frequency throughout her notes, but they remain, up until the last entry, the only traces suggesting the presence of an intelligent life form. From the forty-fourth entry, the notes become increasingly incoherent, with the handwriting degrading to the point of illegibility starting from the forty-fourth entry. Entries #52 to #56 feature crude drawings and prints, all of which features a pair of eyes and a visible decline in the ability to depict objects.
The last entry consists of the following, handwritten in a visibly erratic fashion:
I se eyo u
Only known footage recorded in Plane #52. Retrieved on a handheld phone.
Delivery successful; all further requests to supply Plane #52 are to be ignored.
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