Parallel
Genesis 6:16
Brenton's English Septuagint · Berean Standard Bible
Thou shalt narrow the ark in making it, and in a cubit above thou shalt finish it, and the door of the ark thou shalt make on the side; with lower, second, and third stories thou shalt make it.
You are to make a roof (note: Or skylight or window) for the ark, finish its walls a cubit from the top (note: A cubit is approximately 18 inches or 45.7 centimeters.), place a door in the side of the ark, and build lower, middle, and upper decks.