 With cameras rolling, I watch from a garage just next to the pool, observing some parents checking the water, but mostly they're focused on their assignments and the party. And after 30 minutes... There we go, she went under. Our swim instructor, Kelly, begins simulating a drowning, struggling to keep her head above water, arms clawing for the surface, and just like the real thing, she barely makes a sound. Meanwhile, our guests seem not to notice.