The sun was blazing down from a sky which seemed to me almost black in its cloudless cruelty; as though reflecting the inky marsh beneath my feet. As I crawled into the stranded boat I realized that only one theory could explain my position. Through some unprecedented volcanic upheaval, a portion of the ocean floor must have been thrown to the surface, exposing regions which for innumerable millions of years had lain hidden under unfathomable watery depths.