This is what happens when you go swimming in an outdoor pool at -40°C

Nah, if they were in a pool then they wouldn't be in there long enough for your hair to freeze

Aah.

I thought they were in a natural hot spring

It could be either or

Typical Canadian

In Spain it's impossible, even in the mountains

Sometimes in my town average winter temp is about -25C, -30C. We have not sea and mild summer. But we have a lot of snow. Suum cuique =)

Were do you live?

Ural state in Russia