Dumb luck . . .
. . . or amazing skill.
I'm guessing it's a little of both. According to the news, there has NEVER, repeat NEVER, EVER been a crash like this where everone walked away. 155 out of 155. 100%. Perfect score. Amazing!
Then there was the talking head on Fox news opining that it was easier to land a plane on cold water than on warm water. The cold, according to Mr. Journalism Major Perfect Hairdo, made the water much more dense, allowing the plane to slide rather than grab the water and break up.
Considering that water at 30F is only 0.19% more dense than water at 72F. That's 19-hundreths of a percent, folks. I'm sure that made a lot of difference . . . not!
Stick to journalism, my friend. Science ain't your domain. Really.