People take part in the 5-day Balloons Over Waikato activity in Hamilton, New Zealand, March 16, 2021. (Photo by Zhu Xi/Xinhua)

A hot-air balloon is seen during the 5-day Balloons Over Waikato activity in Hamilton, New Zealand, March 16, 2021. (Photo by Zhu Xi/Xinhua)

People take part in the 5-day Balloons Over Waikato activity in Hamilton, New Zealand, March 16, 2021. (Photo by Zhu Xi/Xinhua)

People watch hot balloons flying above the sky during the 5-day Balloons Over Waikato activity in Hamilton, New Zealand, March 16, 2021. (Photo by Zhu Xi/Xinhua)

Hot-air balloons are seen during the 5-day Balloons Over Waikato activity in Hamilton, New Zealand, March 16, 2021. (Photo by Zhu Xi/Xinhua)