I think that the abyss precisely opens every 27 years. When entering the cabin and finding the bible with the mention of Celine, we can see a date : M DC CLII in roman numerals which gives 1752. And when you do 1752+27+27+27 etc... we come to 1995 and then 2022
I saw someone saying that the cabin being closed from the inside is a direct reference to the abyss itself. Kat and Corey fell and never went out since 27 years, they're locked inside. Yet, we know that a man managed to go out but we don't know how
