This seems like a normal ocean exploration video until about halfway through when they get to the unexpected discovery of thousands of crabs swarming together in murky water like a spooky horde of zombies.
Porsche Indrisie was watching a little crab just chill out on the rocks in Yallingup, Australia when terror struck.
An octopus shot out of the water and quickly dragged the creature beneath the surface.
Indrisie captured the entire moment on video, and you can hear her screams of horror as she witnessed the attack.
Who knew these 8-legged beasts could move so fast? Even sharks are no match for them.
Be afraid, be very afraid.