The British Royal Navy's efforts to chart all of the world's coastlines in the mid-19th century reinforced the vague idea that most of the ocean was very deep, although little more was known.
Royal Navy's bestræbelser på at kortlægge alle verdens kystlinjer i midten af ​​1800-tallet forstærkede den vage ide om, at det meste af havet var meget dybt, selvom der endnu ikke var meget mere kendt.