The oarfish is a rarely seen giant of the deep. Measuring up to 17 meters (55 feet), the oarfish had previously only been seen dead or dying after being washed up on shore. This sighting, by scientists in Gulf of Mexico, may be the first of the fish in its natural habitat.

The creature was spotted using a remotely operated vehicle, which allows scientists to observe sea life at depths that are otherwise unreachable.

For more and to see a video of the oarfish, visit BBC News.