Seismologist Jack and his fiancée Karen went on vacation to a lakeside town, but unexpectedly found a charred body and the wreckage of a yacht that seemed to have been burned by an explosion by the lake. It turned out that a lithium vein buried deep underground was accidentally dug out due to mining negligence not far away. As soon as the lithium ore comes into contact with water, it will immediately ignite a flame, and this vein is actually buried under the lake! Deadly poisonous gas burst out from the underground of the town, igniting an indestructible torch. Just as the military ordered the blockade of the area, two scientists who came to support ─ who were also Jack's friends ─ were trapped in a lithium mine pit due to the earthquake caused by the explosion! Jack went deep underground to rescue, he must stop this catastrophe before the explosion and save the lives of the villagers in the town.