http://mysteriousplaces.com/Easter_Island/index.html
Easter Island is in the south eastern Pacific Ocean. It is one of the most isolated islands in the world but 1200 years ago, and wild speculation about UFO's, Atlantis, and vanished advanced ancient races has always been the debate of Easter Island.
The soft volcanic tuff was perfect material for statue of "Moai" carving. They used harder volcanic rock implements they were able to first sketch out the moai's outline in the rock wall and then systematically chip away at it until the moai was held in place by a thin "keel" . The production of the statues was most likely through conscripted labor with many rituals and ceremonies performed throughout the process. The stone carvers were ingenious in making the most out of sections of rock. Moai can be seen carved in all directions in the cliff face. If a defect would appear in the rock, the statue would be abandoned and they moved on to another area. They took advantage of fissures in the volcanic walls and also variations in colors. Ithink they are the best artist of stone carving.
But it would be very, very difficult to moving the giant statu, how did they move it? Some suggest that they were moved in an upright position and kept stable by crews manning ropes. But we still don't know that how did they do that correctly, and there are still a lot of questions we need to analyse.
Here are the pictures that I found: