We know that sharks have an amazing sense of smell. Actually this sense is so vital for sharks that two-thirds of sharks brain is devoted to it. Great whites for instance can detect one drop of blood in 25 gal (100 L) of water – meaning they can detect some scents at concentrations as low as 1 part per 25 million. In open ocean that would represent to about a third of a mile away.
So the question is not whether the shark can detect that you have peed in your wetsuits or not. It can. The question is – are sharks attracted to pee?
Experiments run by National Geographic shows that NO, sharks don’t care much about pee. Which seems reasonable. Who likes pee:)? NG placed 2 divers in water, one holding a bottle of urine that slowly seeped into the water and another diver, in a separate area, without any urine: Experiment Result: No reaction from sharks.
So pee away, you’re safe.