I usually get in the water early and pee while waiting for the other divers to enter the water. during the descent, I'll pull open the neck of my wetsuit to let new water in and suck in my tummy to get the water to flow down towards peepee zone. Whoever pees in their suite while standing on deck is an animal.
Yup. That and If you have to go towards the end of a dive (Ex. You know you’ll be feet dry in 10 minutes)...just hold it and wait till you get out (access to a head or restroom) so you don’t hop out of the water reeking of piss.
I also utilize the approach outlined above.
Plus I dive a 5mm wetsuit for lower back and leg support, so opening both the neck and wrist seals during the dive allows me to better regulate my core body temperature.