Gen 6:15

6:15 This is how. The Lord uniquely specified the design for the building of the ark, the Exodus tabernacle, and Solomon’s temple. The ark preserved Noah’s covenant family through chaotic water; the latter structures would sustain the later covenant people among the chaotic nations.

300 cubits . . . 30 cubits. See text note. The dimensions (450 by 75 by 45 feet) indicate a stable and seaworthy vessel similar in size to a modern battleship. By contrast the ark in the Babylonian Gilgamesh Epic, though pitched within and without, is an unstable 180-foot cube, about four times larger in volume than Noah’s ark (7:4 and note).