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 ...

As it passed mere millimetres from my body, the cetacean released a massive cloud of excrement that covered me head to fin, filled my snorkel and turned the water a dark brown.

Imagine trying to understand a creature with a brain five times bigger than yours. Their sounds are like underwater techno music. They might be talking about the ocean’s version of philosophy. Project ...