At that time the Khun Tan tunnel drilling, such as the use of modern methods in big tunnel drilled today, it is used to say that this is the cut-out is a two-channel is above and below to the facilities in the land, and out of rock tunnelIn order to meet precise fit for the rock is a large stone is not easy to break in the explosion is one of the little fire, using the methods of the rock mass, is hot on the trail, and then pour water into the rock, that they want to be broke to piecesThere is not enough air to breathe, it is pumped into the air from the outside to help you to breathe in the tunnel8 years ago, through to the other. The color.in between the 2 is the amount of rock drilling out of more than 6, 0 million cubic meters, the mouth of the cave stream cover until it becomes a set of the Khun Tan, in a smooth current
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