22화: 센쿠, 크롬, 마그마가 텅스텐을 찾아다니고 마을 천문대에서 센쿠의 생일을 축하한다.

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In the search for tungsten, Senku, Chrome, and Magma search for a nearby cave. After encountering a mica vein, Magma tries to save Senku from falling into a sinkhole, but both eventually are trapped. Chrome saves them both by filling the sinkhole with water. The three hurriedly return to the village after encountering a deposit rich with minerals to make it in time to celebrate Senku's birthday. While the three were gone, Gen and the village built an observatory for Senku. (Source: Wikipedia)