An Auckland Rescue helicopter was among the emergency services that went to assist.
CPR was being performed on Vaiangina when the helicopter arrived, but he died at the scene.
Vaiangina was a member of the New Zealand Army, having joined in 2015, and was recently based at Linton Military Camp.
Chief of Army, Major General John Boswell, said Vaiangina would be fondly remembered.
“He served New Zealand with pride and will be sorely missed by his colleagues and all who knew him.”
Police are investigating his death on behalf of the Coroner.
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