直通地心？这座毒氣縈繞的淹水洞穴，為何至今仍未見底？ | 赫拉尼采深淵 | 人類極限

Deep in a forest in eastern Czechia, a seemingly ordinary opening cuts into the ground. From the rim, all you can see is a quiet green lake more than sixty meters below. For centuries, people thought that lake was the bottom. Then divers went beneath the surface. What they found was not an ending, but the beginning of a far larger abyss. Divers, probes, ROVs, and underwater robots pushed deeper and deeper: 155 meters, 265 meters, 404 meters, 450 meters. Each mission broke the previous limit. Each one ended with the same result. No bottom. In this episode, we descend into the world’s deepest known flooded cave, following its history from early legends to extreme diving, robotic mapping, and one of the strangest geological mysteries beneath Europe. What is still waiting below that silent green lake?