Both the Mornington and opposite Bellarine peninsulas offer diving centres.
Port Phillip Bay ( the peninsulas encircle the bay) is a popular diving spot.
Queenscliffe is on the Bellarine peninsula, but this ute was parked at Portsea on the Mornington Peninsula.
Probably it crossed the bay on the Queenscliffe ferry.
Queenscliffe Dive Centre offers both training and accommodation.
Wonders of the deep
Diving into silent worlds
Ruby Tuesday 2