From the entrance it is a staggering 80 metres to the bottom of Son Doong, down some steep and treacherous terrain. We donned harnesses and descended through the rock fall, secured with climbing ropes and anchors. With our entire group safely gathered, we continued into the darkness.Approaching the thunderous Rao Thuong River, we paused so we could appreciate the power of this turquoise waterway. It is this underground river that has carved out the chambers of Hang Son Doong and Hang En over two million years. Using a guideline for support, we gingerly crossed the Rao Thuong, knowing that one wrong step here would prove to be lethal.
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