Notes:

Function
As previously stated, one (and only one) coffin in the tunnels has unusual properties. (See #SCP-222-6 for summation of all tests done to date and clarification of items below.) If a living person is placed into the coffin and it is closed, the following sequence of events occurs.
Within 15 minutes, the occupant falls asleep.
The occupant will fall asleep under any circumstances; such as, but not limited to, being in the middle of a claustrophobic fit, or being given amounts of caffeine and amphetamines close to causing an overdose.
The occupant sleeps for 1-2 hours.
Opening the coffin during this time usually results in the death of the occupant and no further results.
The occupant wakes up, feeling well rested.
The occupant will not fall asleep until the coffin is opened again. The possibility of sleep deprivation research has been advanced but not yet implemented.
Within 24 hours, a person will be found within the tunnels who is a duplicate, or clone, of the occupant.
No attempts to find the origin of the clone within the tunnels have ever been successful. The clone invariably finds its way to the coffin, though it usually appears to be wandering aimlessly.