Murderous Metallic Mollusks

Item #: SCP-XXXX

Object Class: Euclid

Special Containment Procedures: SCP-XXXX is, due to it's immovable nature and integral role in the global ecosystem, currently contained on-site at ███████ archipelago, ███ km off the coast of ██████, South America.

Biological Containment Site-94 is to be maintained on ███████ archipelago, under the guise of the Southern Center for Protection of Marine Life oceanographic research institute, and staffed by 7 personnel with sufficient background in marine biology to maintain plausible deniability. All marine traffic is to be redirected away from SCP-XXXX under the guise of environmental protection measures. All supplies are to be delivered by air.

In a 6 km perimeter around the area inhabited by SCP-XXXX, a carbon-fire mesh is to be deployed and maintained to prohibit any metallic objects from entering SCP-XXXX's area of influence while allowing critical marine life to pass through. No metallic objects containing either Potassium, Lithium, Iron, Rubidium, Magnesium or Titanium are permitted to enter the water body of the safe zone designated around SCP-XXXX.

Regular inspections of SCP-XXXX's current size and health are to be carried out by on-site personnel on a bi-monthly basis using the provided, full-rubber standard diving dress utilizing the on-site compressor unit.

Furthermore, SCP-XXXX is to be provided with a nutrient-mix consisting of 2 kg of Li-oxide and 3.5 kg of Fe-III-oxide powder on a monthly basis. This amount of nutrition has been determined to allow SCP-XXXX to maintain it's current size without endangering the surrounding ecosystem by triggering an extended activation event.

Description: Phenotypically, SCP-XXXX is an unusually dense colony of Tridacna gigas ssp. ████ . Anomalous behavior occurs upon introduction of any pure metals or alloys containing Potassium, Lithium, Iron, Rubidium, Magnesium or Titanium. In this case, the entire colony of SCP-XXXX will undergo a significant activation event in which every individual secretes a highly concentrated protein-acid mixture, immediately dissolving any metallic compounds in the vicinity and simultaneously destroying all organic matter but itself. The dissolved metallic compounds are then integrated into the shell of SCP-XXXX individuals while the particulate organic compounds created are used for nutritional purposes. The exact composition of this acid mixture could not yet be determined, as it breaks down rapidly upon cessation of the activation event through unknown means. Preliminary research concludes that the compound is stabilized by a catalytic protein matrix that seems to be linked to SCP-XXXX by unknown means, enabling the colony to keep the compound active for any period of time. Sustaining an activation event for the purpose of studying this mixture for more than 1.5 hours would be highly dangerous (See Addendum 1).

An activation event will also occur upon removal of an SCP-XXXX individual from the colony, upon damaging an SCP-XXXX individual beyond it's natural healing capabilities or upon depriving the colony of metallic nutrients for too long, as the death and subsequent degradation of more than █ individuals will release sufficient Fe-III-Oxide to trigger a resonance cascade wherein the activation of the neighboring individual dissolves the now-vacant shell, which triggers a defensive response in surrounding individuals.

For details on the recovery of SCP-XXXX please refer to Incident 1a and Recovery Log.

Addendum:

+ Addendum XXXX-1 - hide this content A full-scale activation of SCP-XXXX lasting longer than ██ hours has been calculated to likely result in a sufficiently large amount of secretions being released to trigger an XK-class global extinction event due to large-scale extermination of marine life. Research indicates such an event last occurred 252 million years ago, commonly known as the Permian–Triassic extinction event, wiping out 96% of all marine species and 70% of terrestrial vertebrate species.

+ Recovery Log - hide this content Recovery Team: Mobile Task Force Theta-5 ("The Bigger Boat") Command: Foundation Cruiser Delta-3 Foreword: Reports of a "black hole" in the style of the Bermuda Triangle legends have been occurring in the general area, after a preliminary investigation into Incident 1a it was determined that immediate containment needed to be implemented to preserve both secrecy and the safety of the local population. MTF Theta-5 entered the zone in standard SCUBA gear at a distance of 4 km. <Begin Log> MTF Theta-5 This is MTF Theta-5, closing in on the target. Do you copy, command? FC Delta-3 Copy that Theta-5, what can you see? MTF Theta-5 Whole load of nothing, Sir. Looks like any other old reef. Well, there's a whole bunch of clams around. Nothing extraordinary. FC Delta-3 Roger that. Any trace of the missing vessel? MTF Theta-5 Negative, Sir. Looks real clean down here. Not a bit of debris. Are you sure it went under around here? FC Delta-3 Positive. Radar and satellite imaging confirm that the "Alessandra" went under near the archipelago ahead of you. MTF Theta-5 Understood. We are moving closer to the actual reef now, the water seems very clear around here, other than that no- hold on. We got something ahead. Agent J██████, what's that down there? Alright. Patching him through my relay now. FC Delta-3 Right. Please describe what you can see until our remote camera array is set up. MTF Theta-5 Yes, Sir. I am moving closer right now. I can see some rubber hoses on the ground, as well as a tarp and what looks like some shoes. There's a whole load of REALLY big clams on the ground. Like, a shit-ton. FC Delta-3 Copy that. Can you identify the mollusks? MTF Theta-5 Uhh… they are kinda big? Looks like those cartoon clams, you know? Big wavy shell, like a lip on top and really huge. Hold on, I'll see if I can get closer. FC Delta-3 Negative, Agent J██████. Please refrain from disturbing the wildlife until a safezone can be established. MTF Theta-5 Huh. That's weird. They are releasing bubbles when I get closer. The water gets kinda blurry, too. FC Delta-3 Agent J██████, retreat back to ship immediately. MTF Theta-5 J██████, MOVE! [EXPLETIVES REDACTED], what are you doing? Command, he's struggling, the water around him is… uh… disturbed. Looks like it's boiling! J██████, can you hear me? Get ba- <End Log> Closing Statement: Agent J██████ has been killed in action, Agent K██ and S████████ suffered chemical burns on all exposed skin as well as severe decompression sickness upon activating their emergency ascension systems. Containment could subsequently be established with the data gathered in preliminary experiments by the remaining crew of MTF Theta-5.