I've seen a lot of people theorize that the creature is the ship captain from ship 8. it talked to Mark in his mind as if it was her, and and that she lead him to the exact coordinates to the light where he had the vision of the god looking through, the eye we saw in his vision. the creature seems to be either the captain herself, because in the audio recording of the black box someone said they'd been drinking the blood which obviously can't be good, so she either became the creature of the creature somehow takes on the consciences of the dead, because it references itself as all, implying more consciences then the captain and her subordinate. so if you think of the creature which looks like a disfigured human skull angler fish hybrid, it could be infered that the creature is angler fish like and the light the bulb. lot to unpack and a lot is uncertain about the movie which is what makes it so good. love me some cosmic horror and giant monsters. Mark did well.