Scienceabc.com explains how blowholes were formed in the following way: "A blowhole is actually the end product of a long geological process that can take thousands of years, if not longer! At first, the hydraulic action of the waves of the ocean crashing against land causes small fractures in the surface. The constant movement of waves at the bottom of cliffs (or any solid structure at the shore) eats away at the area around the crack and renders it weak enough to create sea caves at the bottom. As if this wasn’t bad enough for the health of the rock, the movement of waves forces air into these small fissures, which are formed on the surface. As a result, the rock is placed under ever-increasing stress. Things become even worse during high tide, as more faults in the rock are created, more of the surface is eaten away and more air is forced into these fissures".
With the volcanic activity and lava in the area, the channels created by a very similar process have created this cool natural sight.
Quite loud in person.....def worth the hike. To be viewed and heard when tides are up/in. See link below for tide chart for Kaena Point.
http://www.surf-forecast.com/breaks/Kaena-Point/tides/latest
To log this EarthCache, the answers to the below logging tasks must be included in an e-mail or message sent to my profile. 1-(optional) post a picture of the location (you being in the picture itself is optional as well) See post image for my example 2-how many blowholes are observed at this location? 3-state the height or length of the shortest and longest spray of any of the blowholes. 4-quickly describe what natural feature is seen between the breaking waves and the blowholes themselves. Thanks for visiting this area and my first Earth Cache. If you arrive and cannot find/see the blowholes in action to provide answers for the find, you will not be able to assume credit. Please utilize tide chart link that is provided to assist.