We followed this cave back for about a half mile until it came to an end, and then with the help of our survey tools we made a three-dimensional map of the cave on our way back out.
我们沿着这个岩洞往后半英里， 直到最深处。 然后在我们的勘测工具的帮助下， 我们在出洞的路上做了一张 洞穴的三维地图。