The MSS-13 is a multi-purpose creature of the Nepiece Corporation. The breed is called the miner crab and has been genetically manipulated to survive in extreme conditions for the development of the deep universe. It sits inside an asteroid made of Ngoa and eats away at unnecessary minerals. Decades later, the nearby asteroid belt, which emits the miner crab, has lost most of its Ngoa, leaving only valuable and solid materials. It takes a long time and sometimes causes casualties, but it is worth more than loading unnecessary minerals into the spacecraft.