142 days = 1308 hours. 5000 miles in 1308 hours is ~ 1.5 mph. Even if it swam for only 8 hrs per day, that is only 4.4 mph.
“that is only 4.4 mph.”
That’s why a fish needs a bicycle!
Don’t sharks have to swim continuously in order for their gills to extract oxygen from the water? If so, this shark was just doing what it always does, what it must do: swim.
Other sharks have to do that, too, but maybe Makos just aren’t stay-at-home sharks.