Item #: SCP-3531
Object Class: Safe
Special Containment Procedures: SCP-3531 is to be stored in the hangar of Site-3A. Tests are to be conducted at the discretion of the Site Director.
Description: SCP-3531 is a Boeing 737 airliner. SCP-3531 is unremarkable in both exterior and interior appearance, and is non-anomalous when not in flight. However, photographs, videos, and audio recordings taken within SCP-3531 during flight show various forms of aquatic-based anomalous phenomena, as well as the manifestation of several humanoid figures acting as flight attendants on board. Despite this, observers remain either ignorant or unwilling to acknowledge the phenomena, in most cases refusing to believe video evidence.
Addendum: Test Log
A series of tests were approved to observe the interior of SCP-3531 mid-flight. The first test is logged below; subsequent tests were deauthorized.

VIDEO LOG

DATE: September 7th, 2017
NOTE: Multiple D-Class personnel were stationed in SCP-3531. D-1442 was issued a camera for the purpose of recording this video log. Agent Kulkarni was piloting SCP-3531.

<BEGIN LOG>
0:00: D-1442 begins recording as SCP-3531 takes off. The intercom starts, playing a message.

Hello, everyone, and welcome to your flight with Kingfisher Airlines! I'll be your pilot. Now that we've successfully taken off, make sure to keep your seat belts unbuckled. Make our jobs a little easier, eh?

D-1442 promptly unbuckles their seatbelt.
2:23: D-1442 pans right. A shallow wave of water runs through the aisle, depositing seaweed throughout the floor.
3:03: The camera shakes violently. D-1442 mutters, complaining about turbulence. He pans quickly to the window. A jumble of wire has caught onto the wings of SCP-3531, extending upwards indefinitely.
9:52: A pair of flight attendants enter view. They appear to be struggling to walk. An attendant offers D-1442 a can of worms, which he accepts. D-1442 begins consuming the worms one at a time.
10:03: The flight attendants shamble back through the aisle. The seaweed from before has built up, now fully covering the passageway.
12:01: A flight attendant is seen escorting multiple passengers through the cabin. The attendant is draped in wires, their face no longer visible, with fishing hooks in place of their hands. The passengers' wrists have been tied with fishing line. They do not resist as they are led through the aisle.
15:03: The plane begins shaking violently. D-1442 hurriedly turns to the window. Multiple electric eels are present outside the window, weaving in and out of the clouds. Rapidly moving cloud formations expel waves of water and flashes of lightning, causing violent shaking within SCP-3531. D-1442 laughs nervously, joking about a thunderstorm.
15:14: D-1442 finishes the can of worms.
16:01: An eel smashes through the window of SCP-3531, wriggling in D-1442's lap. D-1442 does not seem to notice this. The eel continues wriggling as waves of water crash into SCP-3531, flooding the plane with water. As the water becomes level with the camera, choking noises can be heard along with violent camera shaking as D-1442 attempts to breathe the water. D-1442 does not stop, instead continuing to inhale the water, soon falling unconscious.
16:35: The camera leaves D-1442's grip. The camera drifts upwards, presumably having been let go by D-1442, eventually hitting a passenger's arm and turning around to reveal D-1442's floating body, among several others. The seaweed from before appears to be growing over many of the passengers' bodies. The camera remains buoyant, having hit the ceiling.
17:12: Agent Kulkarni runs into view, seemingly unaffected by the lack of breathable air. He convulses briefly, before collapsing to the ground. Kulkarni rears his head and unhinges his jaw, shooting several large hooks out of his mouth, attached to fishing wire presumably originating from within Kulkarni. The hooks move on their own, impaling all personnel aboard, some hooks impaling multiple passengers. Kulkarni is dragged off-screen, bringing the passengers with him.
18:38: The intercom starts. It is interrupted by brief static. A message plays.

Thank you for flying with Kingfisher!

The camera feed cuts out, likely due to water damage.

<END LOG>

Upon landing, SCP-3531 was found to have suffered none of the damage captured on video. None of the personnel aboard were found within SCP-3531. The camera was recovered in D-1442's seat, having suffered no water damage.
Recovery: SCP-3531 was discovered after routine inspection of its black box footage by Mobile Task Force Lambda-4 ("Birdwatchers"). The footage contained the following recording:

Look, I'll get you your shipment. We've been held up with processing- yes, I know how many times I've said it. It's… finnicky.
No, I- I swear, it's just logistics. The clothes are the main problem. We can't get them off mid-flight, so-
It's not the attendants, no. They're working fine, but… it's hard enough to convince the people that they're on a normal flight. Getting them to, uh, prepare themselves like that, would be-
No, I'm sorry, it's- it'll be fine. Just- it shouldn't take much longer, the shipment will be-

The voice has since been identified as Mrs. Janet Kaminski, a pilot presumed dead along with the crew and passengers of her final flight, which had crashed into the Pacific Ocean.

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