A 19.4m wave has been detected south of New Zealand - and the company that recorded the behemoth believes monsters reaching over 20m were probably created by the same storm.
In a collaboration with the New Zealand Defence Force, science-based consultancy MetOcean Solutions recently moored the high-tech instrument in the Southern Ocean off Campbell Island, nearly halfway between the South Island and Antarctica.
Persistent westerly winds and an unlimited area for waves to build combine to make Southern Ocean waves among the biggest in the world.
Yesterday, MetOcean Solutions confirmed it had picked up a 19.4m wave - close to the highest wave ever recorded, which was detected rolling through the North Atlantic Ocean between Iceland and the UK last year.
It's expected the buoy may be ultimately register waves 25m high - the height of an eight-storey building - as it continues its real-time readings fixed in 150m of water.
But MetOcean Solutions senior oceanographer Dr Tom Durrant was nonetheless thrilled with Saturday's detection.
"This is one of the largest waves recorded in the Southern Hemisphere," he said.
"This is the world's southernmost wave buoy moored in the open ocean, and we are excited to put it to the test in large seas."
The company's managing director, Peter McComb, told the Herald that waves larger than 20m likely also occurred between the sampling times, which took place for 20 minutes every three hours.