Oblique view looking east towards Phantom Ship and Danger Bay. The distance across the bottom of the image is about 1.2 kilometers (0.7 miles).

Andesite lava from near the Phantom Ship is the oldest rock found above the surface of the lake, and dates from about 400,000 years ago. Phantom Ship itself is composed of resistant, hydrothermally altered andesite lava. The steep underwater cliffs below it owe their survival to the same alteration system within and beneath the ancient Phantom Ship volcano. Rocks forming the more deeply submerged cliffs almost certainly pre-date the formation of Mount Mazama, as do the rocks of the cliff below Sentinel Rock. Clearly shown in the foreground of this view is the Chaski Bay landslide deposit (A). In the middle distance is the Danger Bay slide.

Source: Gardner, James V., Peter Dartnell, Laurent Hellequin, Charles R. Bacon, Larry A. Mayer, and J. Christopher Stone. 2001. Bathymetry and selected perspective views of Crater Lake, Oregon. USGS Water Resources Investigations Report 01-4046.