Per 
Item #: SCP-XXXX
Object Class: Euclid Neutralised
Special Containment Procedures: SCP-XXXX is to be fed twice a day, both meals consisting of mainly molluscs, worms, and smaller crustaceans. The exact combination of food items per diem is not specified, as long as SCP-XXXX's meals are no less than 3 lbs and does not exceed 4 lbs. SCP-XXXX is to be fed by on-site carcinologist, Dr. Edwards. SCP-XXXX's enclosure is a 15 ft x 15 ft x 12.5 ft glass aquarium tank, the glass encasement being 6 inches thick. The tank is open at the top, salt water filling the tank to around 95% of its volume. The water should be between 58 and 60°F at all times. A foot of sand rests at the bottom of the tank as well as some fake oceanic structures (coral, seaweed, etc.). The enclosure is to be monitored regularly and cleaned once a week by on-site janitorial staff via dive suit.
Description: SCP-XXXX is similar in appearance and anatomy to that of a Japanese Spider Crab (Macrocheira kaempferi). The subject weighs 40.3 lbs, has a leg span of 13.3 ft, and has a carapace width of 20 in. SCP-XXXX's anomalous properties become apparent when someone/something places it under immense stress. SCP-XXXX's shell will camouflage with its surroundings within 15 seconds and the crustacean will also emit a pheromone that causing severe stinging and burning to the threat immediately. SCP-XXXX also has the unique ability to retract its legs into its shell when it feels threatened. SCP-XXXX has shown to be highly intelligent, able to easily complete various puzzles, solve advanced math equations, and even write (See test logs below).
Addendum XXXX.1: Discovery
SCP-XXXX was discovered off the coast of Miyake Island, Japan by Dr. Edwards while she was on vacation. While deep-sea diving, she said that she saw SCP-XXXX attempting to solve a Rubik's Cube. Dr. Edwards stated that she had convinced SCP-XXXX to come near her by playing a game of Peek-A-Boo. This has not yet been confirmed.
The following is a series of documented tests conducted onto SCP-XXXX.
Test #1, 02/13/19, "Rubik's Cube"
Dr. Edwards enters SCP-XXXX's enclosure via dive suit with a Rubik's Cube in hand. She waits for around 6 minutes or so, until movement is seen at the bottom of the tank. SCP-XXXX slowly emerges from the sand, cautiously approaching Dr. Edwards. Researcher Edwards gestures towards SCP-XXXX with the Rubik's Cube. When the subject reaches her, it quickly grabs the cube and swiftly crawls back under the sand.
[End log]
//Dr. Edwards enters
