Hello everyone and welcome back to Scary Interesting. In this video, we're

going over three extremely strange and disturbing things happening deep in the water, or at

least sort of. You'll see what I mean, and as always, viewer discretion is advised.

It was late afternoon on March 9, 1997 in Napa County, California, as locals and tourists together along the shores of Lake Beriesa.

They weren't there to fish or swim, though.

Instead, they were drawn there by a unique attraction the morning glory spillway.

When the lake level is low enough, the spillway looks like something right out of a video

game.

It's a huge concrete tube that looks like it could transport you to a different plane of existence.

When the water is high, however, it looks like something else entirely.

To some, it's like an optical illusion dropped into the middle

of a reservoir. To others, it looks like Lake Beriesa has a built-in drain. In reality, the spillway

is actually an essential part of California's water infrastructure. It just also happens to be

one of the most hypnotic and terrifying man-made features in the entire state, which is why people

tend to gather to see it in action. The spillway sits roughly 200 yards from the Monticello Dam, which is a 304-foot-tall,

concrete arch built between 1953 and 1957 to create the Lake Beriasse Reservoir.

When it rains too much or the nearby mountain snowpack melts too fast, all the water has to go somewhere,

and that's where the spillway comes in.

At the surface of the lake, the spillway is 72 feet or 22 meters in diameter.

This is big enough to comfortably fit a semi-truck on its side.

It then plunges straight down over 200 feet or 61 meters before narrowing to a 28-foot

or 9-meter- wide pipe at the bottom.

...