Hannibal Bank seamount off the coast of Panama is an ecological hotspot—a place where many different species can be found. During a trip to Hannibal in 2015, divers in a human-occupied sub found a cloud of sediment on the seafloor near the bottom of the seamount with hundreds of objects moving around inside. The objects turned out to be red crabs, an abundant species never before seen this far south, but known to be a source of food for larger predators such as tuna and whales. The crabs were in a region of low oxygen, possibly to avoid predators. Using an autonomous underwater vehicle, they took photos of the swarm and found that the crabs were grouping like insects, a behavior rarely seen in the ocean. Their discovery could not have been predicted and demonstrates the importance of human observation in the ocean.