Part 9/11:
The idea of undersea civilizations, he suggests, is plausible given the vast mountain ranges and caverns beneath the ocean's surface. Advanced species could have the technology to create breathable air or survive in harsh environments. However, the natural aversion of humans to living submerged, the need for sunlight, and the pressure extremes make such conjectures largely speculative.
The Infinite Unknown and Maintaining an Open Mind
Throughout his musings, he emphasizes the importance of keeping an open mind. He admits that we know very little about our planet and universe—remarkably less than we assume—and that many discoveries await us. He points out how humans constantly find new species, hinting at the vastness of what we have yet to understand.