Harry Hess helped with the plate tectonic theory. In 1945, when he was the commander of the USS Cape Johnson, he discovered that the sea-floor was spreading. While he was traveling around, he would leave the sounding equipment on that would take measurements of the sea floor. One of the main things he worked on is proving that the sea-floor is spreading.
Harry Hess was born on May 27, 1906. He was born in New York. He got his PH.D. in the 1932 and his degree a year befor. He taught for one year at the University of Rutgers. Then later on he researched associate in a Geophysical Laboratory at the Carnegie Institution in Washington. In 1934 he started working as a professor at the Princeton University and he became the head of the Geology Department in 1950 and in 1964. Harry Hess became a military worker and fought in World War 2. Later in his career, he became the captain of the USS Cape Johnson, an attack transport ship equipped with a new technology called the sonar. With this new tool he was able to start his study of seafloor spreading. He could use this to study the seafloor and see what has changed and what is even moving. He ended up going on an unexpected ride to war over the Pacific Ocean which
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Today we could just go under water in a full suit and just take a picture with our phones or even just send down a camera or a drone to take pic for us. Unlike then when they didn't have any drones or even a way of taking a camera underwater without it getting waterdamge they didn't even have the gear to swim down. Almost no man can swim nor even be able to hold their breath or even withstand how cold it would be. He was very limited by how little equipment they had. Also they couldn't really tell how old it is until they took many pictures of it from there