Don't breathe, and definitely don't say "cheese" - Christmas photo calls are a little different when you are a member of the Royal New Zealand Navy's operational diving team.
It took photographer Chris Weissenborn about three tries to get the shot of the team posing in the Devonport Naval Base swimming pool on the North Shore.
Mr Weissenborn, the Navy's photographic manager, said that after a bit of practice at the poolside, the dive team members sank to the bottom and took their positions around the waiting chairs.
"Everyone knew exactly where they were standing or sitting, and then the divers had to get all the air out of their lungs to try to sink down. A few of them needed the assistance of the odd lead weight."
To accomplish this, they expelled the air out of their lungs and - weighted down - sank on to the chairs and into formation.