A team of scientists says it has found a string of vast, rich forests in an unexpected setting: far below the coral reefs found in the tropical Pacific Ocean. The new forests are made out of kelp plants that harbor a huge range of plants and animals. Like tropical rainforests, they may be refuges from threats posed by global climate change. For many, the case is a reminder of how little we know about what’s underneath the ocean. The team of American scientists says it found a vast underwater forest in an unexpected location.