Per 
Just tryna learn.
D-XXXX standing just within SCP-XXXX
Item #: SCP-XXXX
Object Class: Euclid
Special Containment Procedures: A perimeter around SCP-XXXX is to be cordoned off, with the cover that the tunnel has been deemed hazardous by the local Forestry Commission. Guards disguised as Forestry Commission volunteers are to keep public from entering SCP-XXXX.
References to SCP-XXXX in tourist websites for the area have been removed, and books such as walking guides referencing SCP-XXXX are to be removed from sales. All paths leading to SCP-XXXX are to be removed.
SCP-XXXX is to be sealed on both sides by concrete. Remote, 24/7 audiovisual surveillance of both sides of SCP-XXXX and the surrounding forest is to be maintained. No further testing of SCP-XXXX is permitted.
Description: SCP-XXXX is an approximately 0.8 km (0.5 miles) long railway tunnel located in ███████, Scotland, running east to west. The tunnel is constructed from bricks made of stone quarried from the ██████ Quarry, and are dated to some time in the late 19th / early 20th century. The inside of SCP-XXXX is covered in rings of ice, with large icicles extending from the ceiling. The internal climate of SCP-XXXX is constant, at -15 degrees Celsius and 20% humidity, this is unaffected by the surrounding climate; attempts to modify the climate by artificial means (heaters, fans, etc) have failed.
SCP-XXXX's internal climate will not change until an individual enters alone, and moves at least 100m inside the tunnel. This individual will then be designated SCP-XXXX-1. The climate will change over time in a unique fashion depending on SCP-XXXX-1's emotional state. The ice will remain unaffected by whatever changes occur. At the same time, whatever emotions SCP-XXXX-1 has upon entering the tunnel will be increasingly amplified over time as long as they remain in SCP-XXXX. This will continue until either SCP-XXXX-1 leaves the tunnel, or a "breaking point" is reached. No anomalous properties occur when 2 or more individuals enter SCP-XXXX.
If SCP-XXXX-1 exits SCP-XXXX before the "breaking point", their emotions will remain in their amplified state for some time after, depending on the duration they spent in SCP-XXXX and the type of emotion. It appears generally positive emotions last a few days, while negative emotions can last months.
Approximately ██ minutes after entering SCP-XXXX, SCP-XXXX-1 will enter a severe state of emotional distress and will attempt to leave SCP-XXXX. SCP-XXXX-1 will be inconsolable, often violent, and will move erratically. These effects are short lived, lasting 2-3 minutes. Research is ongoing into any permanent effects of prolonged exposure to SCP-XXXX.
If restrained and held within SCP-XXXX for a further █ minutes after "breaking point", SCP-XXXX-1 seems to lose all emotional capacity, deemed by psychological analysis to be some form of induced psychopathy. This effect is permanent.
Note: The emotional effect could be useful for D-Class or armed personnel, however procedures to prevent self harm while in SCP-XXXX must be developed first. A psychopath who has bitten their own arm off is not useful.
- Dr. █████
