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DALLAS (CBSDFW.COM) – While the search effort has been scaled back, crews will continue on Wednesday to look for an SMU police officer who was swept away by rushing waters more than two weeks ago. Newly released surveillance video shows the man trying to get out of harm’s way.

It seems improbable that the normally calm Turtle Creek in Dallas could turn into a raging river. But that is what happened on July 5 when the water level came up high enough to sweep away Mark McCullers and his car. A nearby home’s security camera captured what happened in the flood.

McCullers: It’s flooding. It’s about to go in my car.

Dispatcher: Okay, you’re in your car?

McCullers: Yeah, I’m in my car. My car is moving right now.

Dispatcher: It’s moving on its own or are you floating?

McCullers: Moving on its own.

McCullers was working a private security job at a construction site in the area. Strong storms moved through North Texas and flash flooding brought the creek’s water level up above bridges. McCullers called 911 from his car and, at one point, stated that the water was up to the hood of his vehicle.

Dispatcher: Do you need the engine over there to do a water rescue?

McCullers: Yeah, I think so. It’s getting to the point where it’s getting pretty heavy.

Dispatcher: What kind of vehicle are you in?

McCullers: Dodge Charger.

Dispatcher: What color?

McCullers: White in color.

Emergency crews quickly responded to the scene but, by the time that they arrived, the water had already dropped back down below the bridge — and there was no sign of McCullers or his car. The surveillance camera video offers a better understanding of what the officer was up against that night, and how dangerous flash flooding can be.

The video shows the car being rushed away into a drainage tunnel. Search crews found the sedan, however, there has still been no sign of the officer. Crews with Texas Parks & Wildlife are continuing to search for his body in both Turtle Creek and, most recently, the Trinity River. McCullers was a Marine and a father to six children.