The giant stone sank fast.
Underwater, at three hundred feet, barely enough light remained to reveal its tumbling silhouette. Passing five hundred feet, the rock plunged into total darkness.
It fell for almost twelve minutes.
Then, like a meteorite striking the dark side of the moon, the rock crashed into a vast plain of mud on the ocean floor, kicking up a cloud of silt. As the dust settled, one of the ocean's thousands of unknown species swam over to inspect the odd newcomer.
Unimpressed, the creature moved on.