In many ways, the deep ocean feels like an entirely different planet from the one we live on—home to some of Earth’s most extraordinary creatures, two of the most evocative being the largest toothed ...

Down in the midnight zone, where light fades to nothing, a single breath becomes a long commitment. Sperm whales slip beneath the surface and vanish into cold pressure that would crush most animals.

Credit: Wikimedia Commons Living in the icy waters of Antarctica, the colossal squid reaches a bulkier size than its giant relative, weighing over 1,500 pounds. Its massive eyes, the largest of any ...