Per 
Item #: XXXX
Object class: Euclid.
Special Containment Procedures: A 1-Mile perimeter is to be fenced off around SCP-XXXX, under the cover of dangerous hornet infestation. This fence is to be patrolled by foundation operatives, armed with standard Biohazard US level B Biohazard suits, hunting rifles, and aerosolized antifungal dispenser hoses. Fungi spreading farther than .75 miles of the aperture are to be destroyed, as is any fauna advancing past this point.
Description: SCP-XXXX is a large cavern underneath the state of ██████████ in the United States, with an aperture in a shoreside deciduous forest, and an additional large opening connected to the adjacent atlantic ocean. The oceanic aperture prevents the spread of foreign material save for water and dissolved materials, making foundation operations within the forest aperture ideal, and aquatic operations irrelevant.
The forest opening of SCP-XXXX is heavily overgrown with fungi and slime molds. Fruiting bodies, especially of gasteroid fungi, infest the majority of the terrain in this area. It was initially thought that 6 new species of anomalous fungi were discovered here, however genetic testing has classified 3 of the species as SCPs 020, 1077, and 4984. None of these anomalous species exhibit their usual abnormal properties even when removed from SCP-XXXX’s field of influence, and so may all be considered neutralized instances. The fungi and myxomycetes rapidly regenerate up to the point of .75 miles, and are incapable of further spread naturally. The large quantity of spores in the air poses significant threat to any unprotected animal life attempting entry.
SCP-XXXX will occasionally produce an animal from its above ground cavity, which will attempt to escape into the wilderness. These animals are hybrids of 2 others, which will invariably be from two different phyla. While instances seem to have immunity to the spores present in the air, instances will perish when removed from the radius of the fungi and reintroduced to the environment. Subjects occasionally pose moderate threat to foundation personnel, but are usually easily terminated. A table of example instances is listed below:
| Animal combination | Appearance | Behavior |
| Mallard duck and tuxedo urchin | Subject took the body plan of a standard sea urchin, however the lower spines were extremely long, allowing it to move relatively quickly in large strides, and the upper spines were replaced with beaks, each of which rapidly opened and shut. The tube feet originally used for locomotion now were composed of metallic green feathers. | Subject rapidly moved towards foundation operatives, before stopping exactly 10 feet away. Target’s locomotion was observed, then terminated. |
| Velvet worm and alligator | Subject took on the body plan of a velvet worm, however was roughly 10 feet long. Subject’s skin was covered in alligator scales, and instead of the standard circular mouth of Onychophora, it possessed a large maw filled with sharp teeth. Subject possessed the ability to shoot a highly acidic, sticky substance from nozzles on the side of its head. | Subject attempted to escape, and fired liquid at foundation operatives, killing █. Subject terminated |
| Orangutan and Venus’ flower basket sponge | Subject took on the body plan of the sponge, however rather than being composed of silica it was fleshy and covered in orange fur. It possessed large muscular arms, and whenever sufficient air currents passed through it, it produced a sound similar to a male orangutan | Subject attempted escape, however was terminated immediately upon engaging with foundation personnel. |
Exploration log 3/2/2013:
In an attempt to discern the interior functions of SCP-XXXX, a foundation exploration team was dispatched to observe the interior of SCP-XXXX. D-Class 2763 and 9780 were dispatched, along with project head researcher Brand. All three were armed with standard US level A biohazard suits, flashlights, sample collection jars, and Pistols. Brand has a camera clipped onto his suit, and all three have communications devices.
Researcher Brand and the two D-Class enter the cave. The fungi thin out slightly, revealing an organic material underneath. It is wet and spongy, and secretes a red liquid on touch. A faint sound of wet thuds is heard deeper in the cave.
D-2763: Either of you hear that?
Brand: Yes. This is certainly worth observation.The group proceeds forward into the cave. The fungi cease thinning, remaining at a consistent thickness on the organic walls for the rest of the exploration.
D-9780: This seems kind of dangerous, are you sure we should-
Brand: Yes.A Number of hymenoptera insects can be observed performing small tasks on the walls of the cave, building small hives bearing abnormal construction. The insects move in unison when switching tasks and do so frequently.
Brand: Could one of you please grab a sample of one of those hives, and an insect?
D-2763: Sure.As they proceed, the thuds become much louder. The cave appears to open up into a large cavern, and the opening into it emits a dim orange light.
Brand: Through that hole.
D-2763 and Brand enter and begin descent.
Brand: 9780, get down here!
D-9780: Fuck you dude, that’s terrifying!
Brand: I don’t care, 9780, you’d better get down here or so help me-
D-2763: Just come down, it’s probably fine.D-9780 climbs down the wall. They find themselves in a large cavern, with walls coated in a greenish film, with a large tub taking up half of the area. The tub has a faint orange light emanating from it. Two large piston-like structures made of fungus can be seen, and they occasionally slam into the tub.
Brand: 9780, please view the source of that orange light and acquire samples of what is creating it if possible.
D-9780: Hell no!
Brand: Fine. 2763, you do it instead.
D-2763: Sure thing.Brand hands his camera to D-2763, who then climbs up the tub. There is a tube filled with glowing orange liquid, which pours into large, fungus-coated indentations under the pistons. The indentations have an opening which leads downwards. The pistons slam into the indentations, and the orange liquid vanishes. D-2763 collects a small vial of the orange liquid, then leaves. They proceed deeper, and find themselves in another large cavern. It possesses large transparent panels filled with cassiopeia jellyfish on the walls. Transparent material later confirmed to be chitin.
D-2763: Hey, have you guys noticed anything about these jellyfish?
Brand: No. What is it?
D-2763: They all kind of… move in rhythm. It’s not just me right?
Brand: Interesting. Perhaps we should stay here for a while to capture video, and our breath.
D-9780: Now we’re talking.The group sits there for roughly an hour. Later reviewing of footage suggests jellyfish were being used as on off switches in various complicated calculations. Total translation of the codes being used is presently deemed a waste of resources. Group proceeds through a thin tunnel, which loops back around underneath the piston room. They come across a third large cavern, which becomes flooded the farther towards the back it goes. It has many species of Animalia present, however all are in a state of stasis, and are attached to the walls with fungus, or within an chitinous aquatic tank similarly adhered. All have a date written in Physarum slime molds above them. D-2763 approaches one of the tanks closest to the flooded region. It Contains a small grape sized jellyfish within it. The date written above the tube is the present day. 3 months later, it was discovered in the wild and named Bazinga Rieki. It has been confirmed that 3 months after the inscribed date on any given animal’s tube, the animal will be discovered by humans in the wild.
D-9780: I don’t think we can go any deeper.
Brand: You are right. We should return to site 46.Agent Brand and both D-Class returned to the site. Upon leaving the .75 mile radius of SCP-XXXX’s aperture, the orange fluid disappeared from the sample tube. Brand requested D-2763 not be terminated, as he would like to keep them as an assistant for managing explorations in SCP-XXXX. As Brand is a level █ foundation employee, request was granted. D-2763 is now to be referred to as their clearance level, then assignment number.D-9780 terminated as normal.
Addendum 8/11/203█:
Due to the low threat posed by SCP-XXXX, further testing is to be suspended indefinitely, as it was deemed a waste of resources by the director of site 46. 3-2763 is to be placed in charge of management of remaining resources for containment.
