Most of the ground work Tuesday, March 17, 2015 was to establish the location and estimated size of the two lava tubes coming out of the June 27th vent area on the north flank of PuÊ»u ʻŌʻō cone. The area in this image is between the cone’s north flank and a perched pond that formed last summer (arc-shaped feature on the right side of the image). The visual image shows the general location of the main tube before it splits downslope. Photo courtesy of USGS/HVO