A wildly fascinating 12-minute video from the always-hilarious YouTube channel Map Men about the reason for a surprising black spot that could be seen on Google Earth until 2012.

Reading the Wikipedia entry after watching the video adds extra color to the mystery, turning it more squarely into a “software quality” story:

Some scientists were initially skeptical that such an error could exist, since a signature was present in various global terrain data sets, such as the bathymetric data from the General Bathymetric Chart of the Oceans, which reported an elevation of 1 metre (3 feet) over the location of Sandy Island. Some data sets derived from satellite imagery indicated that sea surface temperatures were absent in the location, suggesting the presence of land.