This week, Kang Nam, JB, and Sol Bin head to second hidden spot. In order to find the glass, they must go inside the sinkhole. At the same time, the third hidden spot seems to be inside the cave. Will they be able to check the hidden spots safely? Meanwhile, Chun Hee and Jong Hyun make sea fishing tools while Byung Man heads to the sea at night to catch some fish for other tribe members.