Aikahi Bunkers (Kalaheo Hills)

by kenji SAITO on May 16, 2026

Hiking Aikahi Bunkers (Kalaheo Hills)

We spent today roaming a different set of hills for an early easy birthday hike. A lot of trails were considered after a severe thunderstorm cell had pounded the island yesterday. I was praying that we didn’t have to visit another waterfall anytime soon, my birthday wish came true.

Kalaheo Hills

Kalaheo Hills

Thanks to Chico and Dave for shuttling us to our starting spot in the neighborhood. I had done this particular route over 12 years ago but from the other side, time to tackle it from the back side. Change of pace.

Kalaheo Hills

Kalaheo Hills

Pushing through chest high California grass as we headed towards the hills.

Kalaheo Hills

Kalaheo Hills

Nothing like a random stranger singing happy birthday to you. “What’s your name? Happy Birthday to you!”

Kalaheo Hills

Kalaheo Hills

A poor man’s version of a Schwinn bicycle.

Kalaheo Hills

Kalaheo Hills

Going off the beaten track.

Kalaheo Hills

Kalaheo Hills

Are we going the right way?

Kalaheo Hills

Kalaheo Hills

Following another overgrown path. The hills are honeycombed with trails that will all take you somewhere.

Kalaheo Hills

Kalaheo Hills

We looped back to see the painted rocks. We got time as this is not going to take all day right?

Kalaheo Hills

Kalaheo Hills

Headed towards the direction of Kalaheo High School, look back before we miss it.

Kalaheo Hills

Kalaheo Hills

We scrambled up to the paint splattered rocks with commanding views of Kailua Town, the Mokes, Olomana and the surrounding ocean views.

Kalaheo Hills

Kalaheo Hills

Drone view of the painted rock that is painted annually by the graduating seniors in the school’s blue and orange colors.

Kalaheo Hills

Kalaheo Hills

Life on the rock.

Kalaheo Hills

Kalaheo Hills

Painter’s point of view.

Kalaheo Hills

Kalaheo Hills

Time to take our leave of the pigmented soaked rocks and get back on the trail.

Kalaheo Hills

Kalaheo Hills

You f*cker! I got you again!

Kalaheo Hills

Kalaheo Hills

Leaving the oppressive humidity behind us as we left the stifling overgrowth behind us and traded it for exposed and windy ridge line conditions.

Kalaheo Hills

Kalaheo Hills

Chico passing the carrion flower native to South Africa down the line for a sniff test. The offensive odor is emitted to attract flies due to the absence of nearby pollinating insects.

Kalaheo Hills

Kalaheo Hills

Making our way to the first pillbox on exposed Mahinui Ridge.

Kalaheo Hills

Kalaheo Hills

The rest of the group climbing up the last steep section as we neared the summit of Pu’u Papa’a which loosely translates to scorched hill.

Kalaheo Hills

Kalaheo Hills

We creeped up to signs of urbanization in the hills. Stairs. Road. Communication towers.

Kalaheo Hills

Kalaheo Hills

Exploring the exterior of the double-decked bunker that was once used as a fire control station during WW2.

Kalaheo Hills

Kalaheo Hills

Drone view of the bunkers technically known as B3 S3 Base End Station and Triangulation Station Papa’a.

Kalaheo Hills

Kalaheo Hills

Climbing down inside the bunkers to check out the constantly changing artwork that decorates the interior walls.

Kalaheo Hills

Kalaheo Hills

Mahalo to everybody for our double elevated cupcakes and those that came to sing us a song. What better way to spend our early birthday than inside a phallic painted bunker complete with a decomposing rodent and ammonia infused scents. Thanks guys!

Kalaheo Hills

Kalaheo Hills

A UFO came and abducted Allison, Nusay and Susan for reasons known only to the aliens. They came back later to collect Dave and Ferlino as they needed gender representation.

Kalaheo Hills

Kalaheo Hills

Our group dropped to seven in numbers as we continued down the crumbly ridgeline.

Kalaheo Hills

Kalaheo Hills

Following the dropped communications cable as we made our way to the next bunker.

Kalaheo Hills

Kalaheo Hills

Climbing up the rickety and rusting “billboard.” Don’t try this at home kids.

Kalaheo Hills

Kalaheo Hills

Top of the defunct microwave relay antenna. Now how do we get down?

Kalaheo Hills

Kalaheo Hills

Explored the dark and dank Battery Commander’s Station (BCS) that was built in 1944 that would have directed the two 8″ guns that were located in Battery 405 further down the hillside and renamed Battery DeMerritt after the war ended. The guns were never fired in anger and were soon dismantled after the war, the battery itself consists of 210′ deep tunnels that were purchased by Gary Weller in 2000 and turned into a data center.

Kalaheo Hills

Kalaheo Hills

Pushing through the overgrowth to check out the water tank that was located below the BCS.

Kalaheo Hills

Kalaheo Hills

Climbing up the empty water tank, short legs and all.

Kalaheo Hills

Kalaheo Hills

We dropped into the bowels of the echo chamber to discover a graffiti message for us? Ahh, they shouldn’t have.

Kalaheo Hills

Kalaheo Hills

Circling the colorfully decorated cavernous tank that was supposedly cracked during test firing of the 8 inch coastal battery guns back in the day.

Kalaheo Hills

Kalaheo Hills

Gecko’s eye view of the group.

Kalaheo Hills

Kalaheo Hills

Climbing our way out of the old water tank.

Kalaheo Hills

Kalaheo Hills

Drone view of the tank.

Kalaheo Hills

Kalaheo Hills

We had to bushwhack a bit before finding the trail again.

Kalaheo Hills

Kalaheo Hills

Dale scooting his way down over some rocks.

Kalaheo Hills

Kalaheo Hills

What is that crawling all over the rocks we had just climbed down from? Centipedes?!? Glad we saw it after the fact.

Kalaheo Hills

Kalaheo Hills

Finding our way out of the jungle without popping in somebody’s backyard was a lot harder than expected.

All pau

All pau

We missed the actual exit trail by that much!

Nico's

Nico’s

Chico suggested we walk to the second restaurant owned by French born chef Nico Chaize as it was shorter than returning to his house. Aida, Cristy, Ferlino, Lilia and Nusay joined us for our post hike meal. Many thanks to Chico and Lilia for Mari and my lunch.

GPS Tracks

GPS Tracks

Our romp in the hills covered 3.44 miles with cooperative weather, amazing scenery and explorations with fun friends. Thanks to Chico for organizing our early birthday hike and all the participants that hiked with us today. Shout out to Aida, Aileen, Akira, Allison, Andrew, Ani, Chico, Cristy, Dale, Dave, Edgar, Ferlino, Kenny, Lilia, Marilyn, Roger, Susan and Tessa for the gifts. Until the next adventure. Mahalo!

Photos/Crew taken by Aileen Agustin, Allison Banks, Chico Cantu, Dale Yoshizu, Dave and Susan Katz, Ferlino Carinio, Kenny Lui, Mari Saito, Nusaybah Roberson, Roger Schiffman, and yours truly. Not necessarily in order.

Note: I have been made aware that some hikers have been using my blog as a hiking guide and getting lost on the trails. Please note that this blog was made to document the hike for the crew(s) that did it. That is why some of my comments will seem to have no relevance or meaning to anybody outside of the crew(s) that hiked that trail. My blog was never meant as a hiking guide, so please do not treat it as such. If you find inspiration and entertainment from these hikes, that is more than enough. If you plan on replicating these hikes, do so in the knowledge that you should do your own research accordingly as trail conditions, access, legalities and so forth are constantly in flux. What was current today is most likely yesterdays news. Please be prepared to accept any risks and responsibilities on your own as you should know your own limitations, experience and abilities before you even set foot on a trail, as even the “simplest” or “easiest” of trails can present potential pitfalls for even the most “experienced” hikers. One should also always let somebody know of your hiking plans in case something doesn’t go as planned, better safe than sorry.

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