Queenstown Lakes Mayor Jim Boult said yesterday it was terrible when things like this happened in the district.
"Everybody, I'm sure, is thinking about him and his family," Boult said.
Area response manager Senior Sergeant Allan Grindell said on Friday that the man was on Stevensons Island when he swam out to retrieve a drifting boat but then got into trouble.
Another person swam out to help him but that person wasn't able to locate him, he said.