PLC Sydney offers diving lessons to both PLC Sydney and external students, catering to beginners through to advanced divers during school terms and school holidays. Classes are held at Sydney Olympic Park Aquatic Centre on Mondays, Tuesdays, Thursdays, and Saturdays.
The PLC Sydney Diving Club is affiliated with NSW Diving and Diving Australia. Divers may register as recreational or competitive, allowing them to compete in sanctioned competitions at regional, state, national, and international levels.
The PLC Sydney Hamilton and Senior Swimming and Diving Carnivals are held in Term 1. From these carnivals, students may be selected to compete in IPSHA and IGSA Swimming and Diving Carnivals.