The little known Powerline Road to Emesine Cave is located off Saddle Road, about a half mile south of mile marker 22. Look for a nondescript gravel road on the Moana Loa side of the highway; it will wind its way around to a locked gate prohibiting vehicles from entry, therefore you must park and hike the two and a half miles to the cache site. This is a public trail sometimes used by hunters, so take usual precautions in season.
Powerline Road once ran power over the eastern shoulder of Mauna Loa. Some of the cut power poles can still be seen along the path. This is not a difficult hike as far as elevation changes, but be prepared for long distances of various sized loose rock underfoot, a real ankle twister at times. A welcomed surprise on this hike is two wooded sections of ohia and koa trees, a cool, dark respite from the monotony of all those rocks. The interesting lava sights you will see on your hike are from the 1881 Mauna Loa flow. Both Emesine and Kaumana cave (in Hilo) were created by this lava flow. There are some who believe the two lava tubes connect, although continuity is probably blocked by collapsed sections.
The entrance to Emesine Cave will be on your right. It is marked by an easy to spot brown and gold sign. Reminder: Entering the cave is prohibited without a permit and ill-advised without proper lights and gear. However, if you use extreme caution in descending down into the "pit" that has formed an entrance to this cave, you can get a great view of the very unusual formations and colors along the walls and ceiling of Emesine.