Engineers have started to fill in a sinkhole near Tampa that reopened two years after it swallowed and killed a man while he was sleeping in his home.

Crews could be seen spraying water into the hole Thursday morning before dumping gravel inside the 20-foot deep hole. Officials say they believe the onslaught of heavy rains in the past month caused hydraulic stress on the patched sinkhole.

In March 2013, Jeffrey Bush was asleep in his bedroom on the property when the floor collapsed and he fell in. His body was never recovered.

Florida is highly prone to sinkholes because there are caverns below ground of limestone, a porous rock that easily dissolves in water.