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The CNMB has a digger in the front, which digs up the regolith. After the regolith is dug up, there are vacuum tubes that suck up the regolith and stores it in the CNMB body. The wheels are designed to go through tough surfaces and the camera on the top is to see where the CNMB is going. On the back of the CNMB, there is a little door held closed with latches. This door is to extract the regolith after all of the space in the CNMB is filled up.