Nah, they're using oceans or lakes. Seas are mid.

Comrades! While the imperialists believed that our efforts were aimed at mastering the seas, the truth was far more glorious: we have been forging ahead into the boundless expanse of space, the ultimate frontier of human destiny!

I love how you can't even see the name of the paper, but everyone just instinctually knows it couldn't be anything other than an American publication.

Believe me folks, America is respected again like it has never been respected before... America is now the hottest country in the world...

https://www.seattletimes.com/nation-world/china-may-be-trying-to-hide-submarines-in-south-china-sea/

Hanmarines