Selected daily by the photo staff of National Geographic.
January 30, 2008
A strobe light illuminates the interior of an omedoki, or bone cave, in Palau. Photographer Stephen Alvarez fired the strobe (held by his assistant, seen standing in the cave) from his boat and used a handheld camera to make this image. By using a strobe during a long exposure time (ten seconds), Alvarez was able to make the cave sharp and the surrounding area blurry.