We went swimming in two different pools yesterday. At the first I dunked him three times, and at the second I dunked him just once so Dan could witness it. The key is to blow in a baby's face right before you take them under so they suck in their breath. I learned that little trick years ago when I took a toddler to the Y for swim lessons.
It was nice to be in a pool on at least one of these crazy hot days. Hope you were able to do the same somewhere!