The podcast explores unanswered scientific questions about mysterious aspects of the world and examines what scientists are doing to find answers. The episode with OConnell delves into a 20th-century quest to drill into the Earth’s layers through the ocean, specifically to learn more about a very dense region between the crust and the mantle called the Mohorovičić discontinuity, or the Moho.
“Project Moho was a bust, but it lay a foundation for exploring the ocean, which hadn’t been done before,” OConnell said in the podcast. “We still don’t know that much about it, and every day, almost, we learn something so exciting and so important about our planet.”
OConnell explained that drilling into the ocean allowed scientists to learn about past life and climate on Earth and discover life in the remotest depths of the ocean floor.
“Drilling into the surface sediment, we had no idea what the surface sediment of the ocean was like, and it defined a whole new field of geoscience: paleoceanography,” OConnell said. “And there could be a whole new field of mantle rheology that could be discovered with more pieces of mantle material.”
Read an accompanying Vox article titled “How an ill-fated undersea adventure in the 1960s changed the way scientists see the Earth” online here.