22 Photos That Prove You Have Thalassophobia (Fear of Deep Water)By Brian Gilmore / March 1, 2019 Great White Shark Surfacing Imgur A great white shark can be up to 20 feet in length and can weigh 4,300 pounds. It can swim as fast as 35 mph. Olympic swimmer Michael Phelps’ top speed clocks in at 6 mph. Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22