Gasworkz owner Chris O'Connor said there are numerous contributors to diving deaths in the Bay.
"Diving alone is a big no no, because if you get into trouble no one knows you are in trouble," he said.
Mr O'Connor also said regular servicing of diving equipment also decreases the chance that diving equipment doesn't malfunction during dives.
"When equipment isn't regularly serviced, or serviced at all, it can start to lose buoyancy control and corrosion sets in," he said.
Weather conditions were also natural factors to consider when diving, Mr O'Connor said.
"You need to pick the right conditions and know what to look out for."
Mr O'Connor said he was diving just this week when he resurfaced after 30 minutes underwater to completely different weather conditions.
Instead of diving again, Mr O'Connor said he and his party decided against taking the risk and "aborted" the trip.
One specific requirement Mr O'Connor made mention of was the need for divers to dive with a "safety sausage".
The "sausage", a fluorescent tube in appearance, is a requirement for those diving and can be blown up by mouth or tank to ensure a diver can be seen in the water.
Mr O'Connor said training is also a must when it comes to diving in open waters.
"At a minimum you need a scuba diver training for open waters. A PADI Open Water Diver Course means you are good to go almost anywhere in New Zealand," he said.
Mr O'Connor said add-on courses are also available to extend diving training to include other diving forms such as night diving.