Arming myself with waterproof cameras, I wandered around the rock pools of Terrigal Haven to try some shallow underwater shots.
Well, I wasn't too successful but I learned a few pointers in retrospect:
1 focus videos on one spot underwater - fast movement is visually too hard to watch.
2 use smaller camera for underwater shots in hard to get places using a selfie stick. The balance of the camera is hard to control. So, take selfie attachment for go pro camera.
3 be prepared to get wet.