Lava pours through a lava tube on its way toward the southeast coast of Kilauea Volcano. The lava is pouring over a "falls" at the upper end of the tube, and scientists observed changing levels of lava in the tube during much of the day. When the lava discharge exceeds the capacity of the lava tube, lava fills the tube and spills out onto the ground from one or more skylights to form surface flows. Lava flowing in this tube fed surface flows that were several kilometers from the sea.