 Item number SCP-540. Object Class. Safe. Special Containment Procedures. All instances of SCP-540 are to be handled and stored according to standard protocols for similar non-anomalous live munitions, with the exception that all locations housing SCP-540 are to be equipped with a secondary overhead sprinkler system capable of dousing any given room with herbicidal compound H540 IB9-4LM to a depth of 10 centimeters in less than 90 seconds. All armories that contain SCP-540 are to be located a minimum of 15 meters below ground, with monitoring and testing facilities located above ground as part of site 74A. A secondary site, designated site 74B, is located 117 kilometers away and is to maintain a fleet of firefighting aircraft including no fewer than 10 air tankers. In the event of a partial or full containment breach of SCP-540 affecting more than 0.5 kilometers squared of above-ground land, this fleet is to be loaded with a variety of defoliants and herbicides including Agent Orange and solutions of sodium chlorate and proceed to inundate all areas affected by SCP-540. Description SCP-540 denotes a collection of Soviet-era explosive ordinance of various makes. All instances can be detonated in the same manner as non-anomalous examples and explode with a similar yield and blast effect. However, approximately 35 to 37 seconds following the detonation, a mass of plant life will rapidly grow to cover the majority of the damaged area. All testing to date has resulted in plant life covering a minimum of 90% of damaged areas. The initial growth rate of the plant life is positively correlated to the yield of the originating explosive, but returns to normal for the plant species after approximately 90 seconds. There are currently instances of SCP-540 in Foundation possession and an unknown number outside of Foundation control. SCP-540 was discovered in an abandoned munitions depot near Ukraine on 1999. Following investigation of reports of an unusual amount of non-native plant life appearing in the surrounding areas within a short period of time. At time of discovery, the depot had suffered significant looting with only one portion of the armory undisturbed. Initial testing of munitions recovered from the depot indicate that only approximately 30% of munitions were actually instances of SCP-540. However, instances of SCP-540 are indistinguishable from non-anomalous ordinance and were randomly dispersed among the non-anomalous munitions found in the originating depot. As such, all munitions recovered have been designated SCP-540 as a precaution. Instances in containment range from hand grenades to a single nuclear device resembling a modified version of the SAR bomba with an estimated minimum yield of 75 megatons. Based on current analysis, it is predicted that should this nuclear device possess anomalous properties, its detonation would result in a GK-class hostile greenhouse scenario over a minimum of one-third of habitable land worldwide. Attempts to disassemble low yield instances of SCP-540 for analysis have resulted in premature detonation and result in plant growth in approximately 50% of all such attempts. Instances that were successfully disassembled, then reassembled and detonated, did not display any anomalous properties. Testing log excerpts. Ordinance tested. RGO hand grenade. Resulting plant life. 3.1 meters squared of dandelions in full bloom. Ordinance tested. PFM-1 landmine. Buried. Resultant plant life. 12.8 meters squared of sawtooth sedge averaging 2.2 meters in height. Ordinance tested. 9K-115-2 Metis M anti-tank missile. Resulting plant life. Single black oak tree. Height. 17 meters. Diameter. 0.96 meters. Ordinance tested. OTR-23 OKA-9M714K tactical ballistic missile. Detonated without launch. Resulting plant life. Forest of Douglas Furr covering 19.3 HA. 193,000 meters squared. Lesson complete. If you missed the previous orientation, go watch SCP-539. The perfect distraction right now. Or for the complete course, watch this playlist.