The oil boom across the Eagle Ford Shale is creating another kind of boom: more and more UFO sightings seem to be happening across the big sky of South Texas.

A security camera at an oil rig near Cotulla caught an image of something that appeared to be a unidentified flying object.

An oil rig worker caught something on his cell phone that he didn't recognize.

A rancher witnessed lights darting across the sky over and oil rig about 3 miles from her home near Artesian Wells.

"We knew it was something beyond our expectations, something we could not explain," said Penny Farrell.

Mufon, the Mutual UFO Network, has been busy investigating the sightings.

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