Earth a 4.5 billion year old planet, still evolving. As continents shift and clash, volcanoes erupt, and glaciers grow and recede, the Earth’s crust is carved in numerous and fascinating ways, leaving a trail of geological mysteries behind.
Using a total of 249 miles of rope and hundreds of pounds of lead weight.
It was tedious backbreaking work, but at the time it was the only way.
It would be 75 years before any answers emerged. It took a revolutionary new technology, sonar, to push the investigation forward to the next crucial stage.
