The Tremble Mine is known to work people to their limits in order to gain the materials needed for the Tremble Rock Cave. The people of this cave are worked early in the morning to late afternoon and are given very few breaks. This mine has samurai and Doton users watching over them to keep from casualties arising and keep people from demanding Ryo for being hurt on the job. These mines are deep underground and without any Doton users, the mine would be inaccessible. The Sennika work with the Hyuuga to produce the materials needed. Multiple Sennika reside in these mines as well to keep form harming others when they undergo their rage process.