Per 
Item #: SCP-5921
Object Class: Safe
Special Containment Procedures: The body of water containing SCP-5921 is to be covered with a lead plate, 7cm thick. The only access point to SCP-5921 is a square hatch, 2x2 metres, located directly above the anomalous entity. SCP-5921 is be guarded by no less than two security guards at anytime.
Description: SCP-5921 is located in [DATA EXPUNGED], United Kingdom (Site-████). SCP-5921 is a vortex, three meters in diameter, located in the center of a small lake. SCP-5921 cannot be observed while underwater and all attempts of documenting SCP-5921's interior have proved futile.
Subjects that enter SCP-5921 resurface two to three minutes after entry. All objects or entities exposed to SCP-5921 are permanently altered, having become the diametrical opposite of that which they were before exposure. Any products of SCP-5921 do not reappear after reentering SCP-5921.
Test Log: Dr. ██████
TEST SUBJECT: Alarm Clock
RESULT: Global Positioning System device
TEST SUBJECT: Medieval Shield found in ████████ 2003
RESULT: Disarmed Nuclear Warhead.
TEST SUBJECT: Dell Computer Monitor: E2314H belonging to ████████████
RESULT: Range of Classic Hardback novels including Pride and Prejudice by Jane Austen and To Kill a Mockingbird by Harper Lee
TEST SUBJECT: Paperback copy of The Bible
RESULT: Paperback copy of The God Delusion by Richard Dawkins
TEST SUBJECT: Paperback copy of The God Delusion by Richard Dawkins
RESULT: No output
TEST SUBJECT: Bovine instance of SCP-049-1
RESULT: Human Male, shall be later referred to as SCP-5921-1
TEST SUBJECT: SCP-5921-1
RESULT: No output
Addendum:
Test Log: Dr. █████████
TEST SUBJECT: D-645, Sex: Male, Race: African-American, Age:35, Weight: 106kg, Height: 2.04m, Former Occupation: Personal Bodyguard
RESULT: Adult Female Persian Cat
TEST SUBJECT: D-693, Sex: Female, Race: Caucasian, Age:23, Weight: 63kg, Height: 1.78m, Former Occupation: Nurse
RESULT: Humanoid creature with Amphibious features, Dr. █████████ and 4 guards killed leading to Site wide containment breach. Subject terminated by MTF Squad Epsilon-11
Further experimentation with SCP-5921 has been deemed too dangerous and forbidden on orders of 05-███ and all products of SCP-5921 are to be incinerated.
