Per 
"The amount of activity and uncontrollable danger related to this anomaly in such a large, populated, and continuously expanding area poses an information breach and possibly a worldwide threat if a method of containment isn't found, concerning the reclassification of SCP-6000 from Keter class." - O5-██
Special Containment Procedures:
All instances related to SCP-6000 must be contained immediately. Containment on-site is acceptable, especially if the instance is unmovable plant growth. Any movable instances must be contained at secure locations within the 6000-Zone. Instances are not to be brought outside of the 6000-Zone. Civilians witnessing any of the instances are to be amnesticized. Large-scale amnesticization is permittable, but is currently unadvised.
Evacuation measures must take place during the event of a large-scale uncontrollable instance, such as pollen or spores, to prevent mass deaths. All of Dane County, Wisconsin should be evacuated in such a situation, as the threat is greatest there.
No one is allowed to enter SCP-6000 without approval from at least two O-5 council members. All groups must sanitize completely before entering, and when inside must use level-5 hazmat gear and shouldn't exceed more than an hour in length. Upon the completion of the mission, hazmat suits are to be destroyed via incineration, and all members must again completely sanitize.
No fewer than four guards are to be stationed at the entrance of SCP-6000. If any entity is seen exiting from SCP-6000, it must be contained immediately and brought to Site-608.
The expanse of the 6000-Zone is to be updated biweekly based on the locations of instances outside of the currently existing 6000-Zone.
"With the recent increase of activity related to SCP-6000, it is questionable that we should simply stop the usage of amnestics on civilians in the immediate area surrounding SCP-6000. Surely, the amount of times that we have had to amnesticize the entire population of Madison and it's suburbs has to have some effect on their health, mental or physical. I suggest that we consider stopping the usage of amnestics on the local population, even if it's only for certain situations." -Dr. McGowan
"Asking to stop the amnesticization of half a million people when faced with anomalous entities is quite a big request. That request will have to be denied. The effects of amnesticizing these individuals so many times will be researched, and the possible health effects will be taken into consideration for future amnesticizations." -O5-██
Description:
SCP-6000 is a plant-based ecosystem located about 500 meters underneath the UW Madison Arboretum in Madison, Wisconsin. It was discovered in 1927, and protected under the guise of the Arboretum. The ecosystem is spherical in shape, so that it is located on the inside of the sphere. Localized gravity allows for the access of all sides of the sphere without falling. The total area of the sphere is approximately 200 square kilometers. The ecosystem is only accessible via [REDACTED].
The inhabitants consist of various plant-based animalistic creatures. These beings appear to rely on SCP-6000 for their existence, as they have shown to be unable to survive outside of it's confines. This is because SCP-6000 is able to create and support the complex evolution or mutation of plants. This allows the creatures inside SCP-6000 to develop complex plant tissues that allow for movement, heterotrophism1, and the development of organ systems. Longer exposure times to SCP-6000 will lead to more complex evolutions or mutations.
Animals, especially humans, when introduced to SCP-6000 experience no changes to themselves. However, any plant material, such as spores or pollen caught in hair or pores in the skin, will mutate and evolve without regard to the subject; this will typically result in the death of the subject. Hazmat suits have been shown to temporarily ward off the effects of SCP-6000 for up to an hour and a half.
On 10/23/2018, The Foundation discovered that SCP-6000's ability to cause and support complex evolution of plants escaped the ecosystem; thus, the entities within the ecosystem are able to survive on the surface, and complex plants are able to be created on the surface. The area that is affected by SCP-6000 is designated as the "6000-Zone". The 6000-Zone is constantly expanding and is unable to be contained or slowed, as it has no physical or detectable form, other than the anomalies that are created within it.
Addendum A - Notable Anomalous Instances From SCP-6000:
As of 06/01/2021, there have been over 13,000 separate instances of events caused by the energy seeping from SCP-6000.
Addendum B: Exploration Within SCP-6000:
Test Log 1
06/02/2019
Forward
Mission Control is Dr. McGowan, Head Researcher for SCP-6000. Subjects are D-2785, D-3228, and D-4769. All subjects are Caucasian males, ages 29, 32, and 33. All subjects have audio and video equipment. Subjects are not wearing protective gear. Three previous missions inside, taking place in 1925 and 1926, yielded no results as subjects did not return; this is the first mission since.
BEGIN LOG
Feed starts just after subjects enter SCP-6000. All three cameras are motionless as the subjects stare at their surroundings. A dense forested environment surrounds them; most of the plants are covered in bioluminescent leaves, most green, yellow, blue, or orange, providing enough light to pass as a sunny day, despite it being underground. The trees span approximately 25 meters above, and the leaves completely block any view. A vine in D-3228's feed with blue bioluminescent leaves slowly curls around a tree, but it goes unnoticed.
D-3228 is asked to climb a tree to get a better view, as he is the most physically fit of the group. D-2785 and D-4769 are asked to collect samples to bring back. D-3228 starts climbing the nearest tree, approximately 28 meters high, with orange bioluminescent leaves and a dark red bioluminescent moss covering the bark. D-3228 climbs for two minutes without incident. As he is about 3/4 of the way up, he is startled by a creature that shrieks at him before leaping away. D-3228 is asked to describe the creature, as the camera didn't get a good view of it.
"It was like a squirrel, but it was all green, and it had no hair, ya know. I swear it almost looked like it was covered in leaves!"
D-3228 continues climbing without incident. Upon getting over the canopy, D-3228 stops for a moment, before Dr. McGowan requests that he removes his camera to get a better view. D-3228 obliges, and removes the camera. D-3228 scans the entire area above the trees, showing that the entire ecosystem is in the shape of a sphere, with the bioluminescent trees and plants illuminating the entire place. Flying creatures are able to be seen soaring over the trees, chasing other creatures traveling through the trees. The camera pans behind D-3228, to show a large patch of land, starting about 200 meters away and accounting for approximately 1/4 of the sphere, that resembles a prairie. The prairie is darker than the rest of the ecosystem, as there are fewer bioluminescent plants. Creatures can be seen running around in the prairie, although details are difficult to make out.
On the ground, D-2785's camera captures D-4769 scratching at his neck and face. D-2785 asks D-4769 what's wrong. D-4769 responds that his face and neck are itching, and he thinks that it might be his pollen allergies. D-4769 continues scratching, but no further incidents happen on the ground for several minutes.
D-3228 captures a creature race past him several meters away on top of the trees. It was too fast for any clear images. One of the flying creatures then passes overhead, illuminating it's underside. The creature was entirely green, it's wings were shaped similarly to a maple leaf, it's head was pointed, and it had a tail that was longer, but matched the design of the wings. No further incidence happened for one minute, before D-3228 was asked to descend.
On the ground, the two subjects were informed that D-3228 was descending. D-2785 was caught scratching his head by D-4769's camera. Dr. McGowan then ordered the two subjects to finish up their sample collecting and place them by the entrance. A couple of minutes go by, and the two place their samples by the entrance. They wait over by the tree, and view that D-3228 is almost down. D-3228 is heard screaming, and the tree is seen opening up, pulling D-3228 in.
Immediately afterward, D-4769 is heard screaming. D-2785 faces D-4769, showing an orange mass covering the side of his head and neck. The mass is growing and sprouting leaves, continuing to cover D-4769's body. D-4769 suddenly ceases, and drops to the ground. D-2785 is then heard screaming, shouting for something to get off of him. D-2785 drops to the ground as a substance partially covers the camera. A creature is seen above him, completely green in color, resembling a mountain lion. The underside of the creature opens up, with vines reaching out and bringing in the subject.
Post-Mission Notes
Samples collected by D-2785 and D-4769 were retrieved later that day, as well as a sample of the material growing on D-4769. All samples from collected plants matched similarly to plants native to the midwestern United States, although there was significant genetic and physical differences. The sample collected from D-4769 matched with several pollens from local plants. It is hypothesized that the pollens were located in the pores of all subjects before they went through significant mutations.
New measures will be required prior to entering SCP-6000: complete sanitization to rid of any possible pollens, and hazmat suits, to see if they provide any protections.
Test Log 2
07/18/2019
Forward
Mission Control is Dr. McGowan, Head Researcher for SCP-6000. Subjects are D-2983, a 29 year-old Caucasian male; D-2994, a 31 year-old Hisapanic female; and D-4108, a 32 year old Black male. All subjects are wearing level-3 hazmat gear, and are outfitted with video and audio equipment.
BEGIN LOG
