Video: Michael Phelps is going to race a great white for TV’s Shark Week br Don't forget subscribe my channel: br » Facebook: br br NEW YORK, June 17 — Believe it or not, the most decorated Olympian of all time Michael Phelps is going to race a great white shark for Discovery Channel’s upcoming Shark Week. br br Discovery Channel announced that the 23-time Olympic gold medal winner will race against one of “nature’s deadliest and quickest marine predators” during a TV special to help the channel kick off its annual Shark Week on July 23.