I don't know much about North Korea geography (rivers, lakes) but where I am originally from, swimming was something boys learned when playing as children. It didn't cost anything, you were just using local lake. So this assertion is bullshit, unless this is a cultural thing about North Korea.
This is North Korea you’re talking about.
Your anecdotal evidence is irrelevant when talking about NK.
I presume you are well versed in North Korea customs, yes?
Jeena@piefed.jeena.net to 
I don't know much about North Korea geography (rivers, lakes) but where I am originally from, swimming was something boys learned when playing as children. It didn't cost anything, you were just using local lake. So this assertion is bullshit, unless this is a cultural thing about North Korea.
This is North Korea you’re talking about.
Your anecdotal evidence is irrelevant when talking about NK.
I presume you are well versed in North Korea customs, yes?
Probably about as much as you.