In ancient times, why did the ancients put the coffin on the cliff?

The ancient coffins weighed several hundred Jin. How did the ancients put the coffins on the cliff? Hanging coffin burial is the oldest way of funeral for ethnic minorities in ancient China, which is more common in remote mountainous areas in the south of China. Most of these coffins are placed on steep cliffs.

so how did people transport these heavy coffins to such a high cliff? There are many opinions on this issue. There's not much explanation here. Because of the long history of hanging coffin burial, I think the most reasonable way is to lift the coffin by boat, use the water level and the raised water level, then lift the coffin to the edge of the cliff by boat and put it in a pre-cut hole, or chisel several coffin round holes with a chisel and insert a wooden stick to fix the coffin on it.

Because in ancient times, all places with cliffs were usually in rivers. When there was more rain in rainy season, the natural water level would rise. In this season, people may be in favor of transporting coffins to cliffs. When the water level drops, the coffin buried on it will become a coffin and hang on the cliff. In this way, with the passage of time, the water level gradually declined, even in modern times. After such a long period of experience, with the geological changes, the water level in some places has dropped significantly, and even some cliffs have dried up without a drop of water, so the hanging coffins left on them are getting higher and higher from the ground, hundreds of meters away from the ground, which is unexpected. What people are talking about is how the coffin flew up such a high cliff, which is really incomprehensible and unbelievable.

So some people say that the ancients were good at carrying coffins with wooden boards, winches, pulleys and ropes. There are also rumors that the ancients used capable people who could fly on the eaves and walk on the walls to put coffins. But these are not practical. The ancients had pulleys and winches, so it was impossible to repair the boardwalk. So I still think it is the most realistic way for the ancients to carry coffins by boat.