Activists onboard the Greenpeace ship Rainbow Warrior are today taking action hundreds of miles out to sea, against deep sea mining company DeepGreen. Another protest took place in American port San Diego, where activists confronting a ship chartered by Global Sea Mineral Resources (GSR), a mining company from Belgium. This ship is carrying a pre-prototype mining robot for running tests at depths of over 4,000m on the seabed. Deep sea mining companies are rapidly advancing their exploration activities and developing technologies for commercial mining of the ocean, with the Pacific being seen as the frontier for this industry. The deep ocean is one of Earth’s least understood and least explored ecosystems, which is home to significant biodiversity, and also acts as a vital carbon sink.