There are untold horrors that can be found leagues under the ocean. Whether it's hungry clams emerging from the beach, or a sand striker preying on some fish, we should always respect and fear what lies beneath... no matter how delicious seafood can be.

One particular video, captured by a diver, featured hundreds of spider crabs fighting over a poor octopus like it was the last piece of prime rib at an under-stocked buffet.

Watching this makes us want to reconsider any scuba diving excursions in the the near future, that's for sure.

Elite Daily reports that the spider crabs migrate to Australia's Port Phillip Bay in the early summer. The long journey left the crabs starving and ready to devour any creature in their way.

Definitely not a video for the squeamish. Or octopus lovers.

If that doesn't rattle your bones, here's some footage of thousands of spider crabs molting at the bottom of the ocean floor. Freaked out yet?