Imagine swimming 20K in this pressure cooker

Since this is Pál’s day off before the 1500 tomorrow, he spends part of it training aerobically, so that he’ll be able to swim fast also at the Duel in the Pool in Atlanta next weekend. 20K today, I heard his coach say, and we don’t bother finding another pool to train in. Pál himself grumbled a moment ago that it took him 1 hour 15 minutes to swim just 4500 meters. But at least we’re sure that it won’t be anaerobic ! :-)