The men used a cellphone to call for police, and Mr Black said the jetboat and a local helicopter spent an hour searching in the dark before the boat's crew heard cries for help about 7pm.
"When they found this pair, they were hypothermic and could hardly speak.
"They are incredibly lucky to be alive."
Mr Black said the only thing the pair appeared to have done right was to take a cellphone with them so that they could call for help.
The inflatable boat and oars were not suited for rowing across the lake; they did not have lifejackets for each person on board; and setting off so late in the day was unwise, he said.
Police said they were talking to the men about what happened.
While glad the men made it back safe and sound, police said the incident may have ended very differently and could have been avoided had they been adequately prepared.
At this time of year, it could get very cold and the weather could change in an instant, so it was important to have the right gear, police said.
Some simple common sense checks could prevent needless tragedies:
• Always wear a life jacket when you're boating, jet skiing or using other craft on the water
• Make sure your equipment is safe and working
• Check the water and weather conditions before you set out.
Police, Maritime New Zealand and local authorities all had the ability to take enforcement action against those acting irresponsibly on the water.
Police said they can (and do) prosecute those who break the law and put others at risk.
