Staff of the Catalina Island Marine Institute are calling it "the discovery of a lifetime", and it will top your big fish story for sure!

A science marine instructor was snorkeling yesterday and saw something unbelievable. It was silver, serpent-like and very long.

Staff of the Catalina Island Marine Institute needed more than 15 helpers to drag it to shore on Sunday. They confirm that it is the carcass of an 18 foot long oar fish.

Oarfish typically dive more than 3,000 feet deep so sightings are rare and not much is known about them. It's thought that these very long, serpent like fish are responsible for a lot of sea monster stories throughout history.

It appears as though this one died of natural causes.

Marvel at the sheer size of this thing in the raw video below.