In Prison Break Michael made these origami paper Swans and he dropped one down a sewer/drainage hole in the center of the Fox river state Penitentiary field, where all the inmates hang out in their free time.
If I remember correctly, shortly after this episode, John Abruzzi had a call from someone that had a message that said they knew of Fibonacci's location and in that message included an origami Swan that Michael had previously sent to John's accomplice. I presumed the origami Swan shown previously was a lead up to this scene, so the viewers knew Michael was the one behind sending the origami and knew of Fibonacci's location and that John Abruzzi would team up with Michael.
However, what was Michael trying to do or work out by dropping the original origami bird down the drainage hole there?
This origami scene was included in the show's intro: