In the early 1950s, physicist Edward Teller proposed a nuclear bomb with the potential to alter the planet's very existence. Known as Project Sundial, this doomsday device was designed to be so powerful—10 gigatons of TNT—that its creators hoped it would never be used. But why was such a weapon even considered? In this video, we explore the paradox of Project Sundial, a weapon intended for deterrence, not destruction. Join us as we uncover the shocking truth behind this ultimate weapon, its moral implications, and why it was ultimately abandoned by both scientists and military planners.