Deep beneath the surface off Brazil’s southeastern coast, remotely operated vehicles have been gliding over coral mounds that no scientist had ever mapped. In waters long dismissed as barren deep-sea ...

Like an anatomical panic room, the mouth of a cardinalfish might just be the safest place in the ocean if you’re an unhatched fry. With razor-sharp teeth framing its gaping maw, the male tiger ...

Some have even become favourites among divers and underwater photographers simply because they look too cute to be real. Here ...