Ph’nglui mglw’nafh Cthulhu R’lyeh wgah’nagl fhtagn.
Scientist Maria Seton, who was on the ship, said that the team was expecting land, not 1,400m (4,620ft) of deep ocean.
"We wanted to check it out because the navigation charts on board the ship showed a water depth of 1,400m in that area - very deep," Dr Seton, from the University of Sydney, told the AFP news agency after the 25-day voyage.
"It's on Google Earth and other maps so we went to check and there was no island. We're really puzzled. It's quite bizarre.
"How did it find its way onto the maps? We just don't know, but we plan to follow up and find out."The BBC report includes no information on the mental state of Ms. Seton, or her fellow passengers.
In his house at R'lyeh, dead Cthulhu waits dreaming.