A: The Nakalele blowhole is one of Mother Nature's most impressive marvels. The combination of ocean swell, tidal current and wind combine to create a surge that powerfully forces its way through the lava tube, resulting in an impressive geyser. If you're there early in the morning, you may even see a rainbow in the spray. However, the receding swell also has the capability of sucking unwary visitors back into the blowhole. A good rule of thumb for safely experiencing the Nakalele blowhole is to stay on the dry rocks nearby. Never stand directly next to or over the blowhole, as some visitors have died this way.