What is the author purpose in the story the aqualung bringing ocean exploration to new depths?

How long did Mount Rushmore take to built? How many miles from Avon Indiana to Niagara falls in Canada? What physical feature of the environment mad it difficult to build the great wall? What do people like to do for leisure activities in Turkey? Is visitors a common noun? What side is the players tunnel at twickenham? When did Panama gain control of the Panama Canal? How long is the rio cobre? Who built the St. Louis Arch? What lowland ares is located between the Rocky Mountains and Lake Superior? What kind of workers were needed to build a cathedral? What makes copper different from any other metal? The middle course of the river ganges? Some English settlers live along the Atlantic coast east of the applalachian mountains? Did medieval alchemist's live in the castle? What is the temperate didiuous forest summer temperature? Does Emily Mortimer play Sophie in Howl's Moving Castle? Why is it important for nations to be able to pinpoint the positions of the oceans? How the challenges were overcome for Akashi kaikyo? How does the force on each individual member of a truss bridge affect the stability of the bridge?