underground infrastructure system

bunker; important government or military infrastructure built below ground

en-US/ˌʌndɚˈɡɹæʊnd ˌɪnfɹəˈstɹʌkt͡ʃɚ ˈsɪstəm/
en-GB/ˈʌndəɡɹaʊnd ˈɪnfɹəstɹʌkt͡ʃə ˈsɪstəm/

دسته بندی ها:

underground structurebunker