Alahaka ramp, on the left in the panorama below, was built after horses were introduced into Hawaii. People could climb up and down steep cliffs, but horses could not. Alahaka ramp, and others like it were built so that horses could be used to transport people and goods. Near the base of Alahaka ramp is the entrance to the Waiu-0-Hina lava tube. The far end of the lava tube opens many feet above the ocean. If you choose to enter the lava tube, bring a flashlight, and be careful!