Hawaiian Pyramid

A friend call me this week that I have not heard from in some time. He is living in hawaii and a friend of his took him to see the giant pyramid in hawaii. He said it was a wierd feeling because its a two day trek to get there and there is no signs of anyone living there yet the vegatation around the pyramid is well maintained. Also the pyramid has no opening to it that they could fined. He put his ear up to it and said that he could hear running water. If any one has some storys or more to add about the hawaiian pyramid I would love to hear about it.