Cyanbane

Nestled beneath 3,200 feet of Mediterranean seawater, a neutrino detector called KM3NeT will stare at the seafloor in an effort to see neutrinos making their way through the Earth. The detector, spanning three cubic kilometers, will also serve as a new oceanography observatory in one of the world’s busiest bodies of water, helping biologists listen to whales and study bioluminescent organisms. It will be the largest structure ever made by humans after the Great Wall of China, said physicist Giorgio Riccobene, a staff researcher at the National Institute for Nuclear Physics who is working on the project. “The problem will be that nobody will see that,” he said with a laugh.