日本人は分からない韓国企業が作ったサウジ地下鉄
<iframe width="315" height="560" src="https://www.youtube.com/embed/CGEgQYNQu3Q" title="RIYADH METRO | NOW OPEN TO PUBLIC" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>