His active 足（複）. ジェイコブ has attached yellow bee-bands to prevent any 蜂（複） from crawling up his legs. Before he came to the 洞くつ, he did catch some type of foot fungus, probably in a public shower, which has flaked his walking 肌, and it is just as well for the pristine ecosystem of this faraway 惑星 that ジェイコブ has so well protected his 足（複） from the 石, (that yellow-band, big-shoe protection works in reverse). Future scholars will be able to collect 床石 samples without fear that the archaeological sediments of original-resident DNA have been disturbed by the ほこり of foreign growths brought by astronuts like this one.
