Helona Blowhole is a fun spectacle on Oahu, Hawaii off of Hanauma Bay, is created by water being forced through a lava tube and into the air. On windy days when the tide is high, the ocean breeze sends the waves rolling on to the shore where the rock formation then shoots sea spray high into the air through the tube like a geyser. It is not always at its best every day though. The blowhole is most active when the tide is high and the winds are strong. This is a big tourist spot in Hawaii. People come from all over to enjoy the beautiful scenery and the beach at the cove, When the wave conditions are right, water can shoot up to 30 feet!
After the lava tube explodes, the water recedes as the waves rush away from the shore.