00:00Thousands of invading soldiers swarm the dark stone tunnels of the Derinquia Fortress.
00:05How do defenders block an entire army underground using only a massive half-ton circular stone?
00:12Most people assume enemies could just push the heavy boulder backward to break inside the shelter.
00:18Intricate counterweight pivots allowed defenders to remotely manipulate impenetrable subterranean barricades with minimal physical effort.
00:26Intricate counterweight pivots allowed defenders to remotely manipulate impenetrable subterranean barricades with minimal physical effort.
