What is underground solar container

By combining solar panels and storage in solid, mobile shelters, solar-powered shipping containers are providing solar electricity from cities to rural villages around the world, reshaping the generation, transmission, and use of electricity. Doing most of the work themselves, their finished home cost them $30,000 (solar included). My question, is there any reason why I couldn't dig out an underground bunker (probably a better word than this) and keep the battery bank underground. There are basically three different types of earth berm homes: 1) earth-covered, 2) earth-bunded, and 3) subterranean. Solar energy containers encapsulate cutting-edge technology designed to capture and convert sunlight into usable electricity, particularly in remote or off-grid locations. Before we explore how it works, let’s first get to know the common types of solar energy containers. Ground-mounted utility-scale solar facilities are prohibited in Significant Ecological Areas (SEAs), Economic Opportunity Areas (EOAs), and in all zones other than those listed above.