Thousands of dolphins were spotted off the coast of San Diego by passengers aboard a tour boat, which then followed the "super mega-pod" for more than an hour.

Capt. Joe Dutra of Hornblower Cruises told NBC 7 in San Diego that the pod was more than seven miles long and five miles wide.

“When you see something that is honestly truly beyond belief,” he told the TV station.

Guests aboard the boat started screaming and pointing Thursday when they first saw the school of adult and juvenile common dolphins. Dutra estimated there were about 100,000 dolphins swimming in the area.

“They were coming from all directions, you could see them from as far as the eye can see,” he said. “I’ve seen a lot of stuff out here … but this is the biggest I’ve ever seen, ever.”

The San Diego event is reminiscent of a dolphin stampede caught on video in January off Dana Point.

There, a pod of about 1,000 common dolphins began a stampede, churning across the blue-gray waters off Dana Point at a rapid pace.