地下にあるコンクリートの導水管(土浦市/茨城)
Keywords
concrete,
tunnel,
indoor,
infrastructure,
construction,
improvement,
copy space,
underground,
piping,
construction,
building,
facility,
space,
work,
colossal,
steel,
unmanned,
flooding,
underground,
country,
shield,
depth,
segment,
lifeline,
aqueduct,
space