Red Crabs Swarm Like Insects in Incredible Underwater Video

A strange cloud of disturbed silt in the Pacific Ocean off the coast of Panama unexpectedly led marine biologists to an incredible sight: thousands of red crabs close to the sea bottom that were "swarming like insects," according to the researchers. The scientists were in a submersible investigating biodiversity at the Hannibal Bank seamount — an underwater mountain and a known ecological hotspot — when they spotted a disturbance in the water that led them to the unusual sight at dep