Sea World confines orcas, who could swim up to 100 miles a day in the wild, now have to swim in tanks, and to Orcas that's similar to the size of a bathtub. They would need to swim around 1400 times (around the perimeter of the tank) or 3,105 lengths (back and forth at the longest part of the tank) in the park’s largest tank to equal what they’d swim in the wild.