1977年,明尼苏达州立法机关拨款50万美元以建立一个探索掩土建筑可行性的实验性计划。该计划由明尼苏达住宅资金局(MHFA)负责,聘请地下空间中心进行并设计负责检查整个计划。由于指令中并未提供什么指导性意见,MHFA提出要设计一种能够确切指明掩土建筑面临的主要问题的计划。MHFA进行的初步研究表明,从理论上来说、对于坚固可靠且为大众接 In 1977, the Minnesota State legislature allocated $500,000 to establish an experimental program to explore the feasibility of shelter construction. The plan is the responsibility of the Minnesota Housing Finance Authority (MHFA), which employs underground space centers to conduct and design inspections of the entire program. As the directive did not provide any guidance, the MHFA proposed to design a plan that could pinpoint the main problems facing the building. Preliminary research conducted by the MHFA shows that, theoretically, it is robust and reliable