SCP - 616 Vessel and the gate

SCP 616 is a Keter Class anomaly also known as The Vessel and the Gate.

SCP-616 is a prototype Boeing airplane.
SCP616 's model had various internal alterations, including [DATA EXPUNGED]. Despite the various alterations, the most important feature of SCP-616 is the center left emergency door, which has been dubbed SCP-616-1. SCP-616-1 is a standard emergency door, though partially covered in extensive markings associated with Satanic cults.

SCP-616-1 will autonomously open once every thirty (30) days, and begin to close.
Once SCP-616-1 spontaneously opens, cabin pressure will destabilize as expected, and extreme 'turbulence' is encountered. At various points during the flight, all present personnel may feel as if SCP-616 is quickly falling, though it has been ascertained that SCP-616 remains in relatively stable cruising conditions during all times, including during the times of these events. SCP-616-1's opening may cause certain individuals present to suffer fatal heart-attacks and more.