This happened in Ventura, CA on the 101. A dump truck hauling gravel slammed into the rear of this BMW, sending it halfway off the bridge. The dump truck flew off the bridge, erupted into flames below, and the driver lost his life in the process. Local rescue teams were trying to get the the mom and her two children inside, but were having trouble keeping the car balanced in the process.
Meanwhile, Seabees from NMCB 3 and the 31st SRB were passing through on the way back to Port Hueneme. They were stuck in the traffic from the accident, they caught wind of what was happening and offered to help out. The fire chief gladly accepted, and so they pulled their convoy over, unloaded the CAT extendaboom (Seabee term, I don't know what you really call them) forklift, and drove it to the opposing traffic bridge. They then extended the boom out, supporting the car, and allowed the fire crew to safely extract the passengers.
I do believe I remember hearing that once everyone was safe and they pulled the boom back in on the forklift, the car fell off the bridge.
That's a very proud moment for the Seabees, and was even a major break in protocol. A lot of red tape was bypassed when that petty officer made the call to unload that forklift and help the locals, but due to the circumstances, the leadership back at Port Hueneme understood. The Seabees involved even got recognized for it - so happy ending for everyone - almost (RIP Dump Truck Driver).