《徐霞客游记·楚游日记十》
到此处进入洞中大约已有三里多了。听说洞中的水流到广东连州后，就流出地面，这恐怕是想当然的说法，大抵上它是流入潇江的水流，然而所进到之处，水四处通达，这正是所说的此洞无底的表现。
时余草履已坏，跣一足行，不能前而返。约所入已三里余矣。
We had already traveled about three miles into the cave at this point. There were rumors that the water in the cave flowed to Lianzhou in Guangdong and then emerged from the ground. However, this is likely just speculation, as the water from the cave is probably flowing into the Xiao River. Nevertheless, the water in this section spreads far and wide, which is why it is said that this cave has no bottom.