Whales are some of the largest known creatures to exist (or, in the case of the blue whale ... three visitors crawled inside the whale and remained there for 90 minutes despite temperatures ...

One moment they were paddling across calm ocean waters, and the next, they were plunged into darkness — inside a humpback ... are not the largest; the blue whale holds that title.

Scientists may finally have an explanation for the longstanding mystery of why blue whale calves are rarely sighted, an advance that could help better conserve the critically endangered species.

The frequency was much higher than a blue whale or its cousin, the fin, leaving scientists to ponder the mystery of Whale 52. The leviathan has been heard many times since, but never seen.