This tour was the high point of our trip to Hawaii. It was full of information with incredible things to see. Harry is a veritable fount of details about the lava tube. I would highly recommend it to anyone with an interest in the natural wonders of the world.

Harry's tour is absolutely amazing and you'll learn more than you will remember about the formation of the lava tubes. Harry is extremely safety oriented and respectful towards preserving the unique qualities on, and within the tubes. There are a few ladders to ascend/descend, which are straightforward. Harry is very patient while you stop and take pictures. His knowledge of the tubes is profound as he's thought deeply upon various features and puzzles involving the formation of the tubes over many years. My wife and I strongly recommend this tour, especially the 4-hour tour as some of the finest features in these lava tubes, lie near and at the end. This experience is a "must" when you visit Hawaii, the Big Island. We island-hopped over a 9-day period and this trip rated as good as any of our other favorite experiences on the islands. Thanks, Harry, we will return someday.

We did the "Pit Room" 4 hour tour in April 2023. For us, Kazumura Cave was the top experience in the Big Island! It felt like a trip at the center of earth for a few hours. You enter the cave via a little opening hidden by lush vegetation - it felt a bit like being Alice entering Wonderland. Once inside, we spent 4 hours in the darkness exploring the lava tubes, which kept on changing size, shape, features, texture, even colours! At times we had to duck to not hit the ceiling, at other spots, the tube was 15 m high, in another point it was like a canyon, an underground "Horseshoe bend". Harry is a walking cyclopedia of the lava tubes, making you notice every detail and every slight difference in the texture of the lava - you notice fascinating things, you would never notice alone. After this tour, the Thurston Lava Tube seemed like a miniature. Highly recommended for anyone visiting the island! Bring head torches, wear sturdy shoes and let Harry guide you to the amazing world of Kazumura Cave

My wife and I just did the Maze Tour with Harry on our honeymoon and I cannot express how amazing this tour was. I called Harry up a week before our trip and told him we wanted to get into some caves but we weren’t looking for the “touristy” cave experience you typically get with guided tours. He told me about the Maze Tour and I was hooked on the idea. I have a pretty extensive caving background including vertical caves back in my home state and my wife had done a bit of vertical training with me but this was her first vertical cave. Harry was VERY helpful and knowledgeable when it came to vertical caving techniques and we had brought some vertical gear that wasn’t quite what the tour had in mind but due to his extensive knowledge we were able to make it work without issue. Harry was very informative and passionate about the cave and his tours. He was able to answer any questions we had and didn’t hesitate to point out all the amazing formations we passed by on the trip. He also wrote his own book on Physics, which is a great book because it explains concepts and equations at a very readable level, making the content easy enough to understand even if your math skills aren’t to par. I highly recommend anyone who takes a trip to the big island to stop by and give the cave a tour. It’s so worth it, very beautiful cave and a lot better condition than other publicly accessed caves like Kaumana near Hilo.