The discussion centers on the hypothesis that the Bible's pre-flood firmament was a layer of water orbiting approximately 1,720 miles above Earth, challenging traditional interpretations of the flood narrative. The calculations suggest that a firmament of 13 to 50 feet thick could account for the volume of rain described in biblical accounts, arguing against the vapor canopy theory due to its impracticality. Critics raise questions about the feasibility of such an orbiting water layer, including its visibility and effects on light and cosmic rays. The conversation also touches on the origins of flood narratives, suggesting they may stem from historical events rather than a global deluge. Overall, the thread explores the intersection of biblical interpretation and scientific principles, inviting further scrutiny of the calculations presented.