A BOMB disposal team swooped on Carbis Bay after railway track detonators were found wrapped around a safe.
A man was renovating his late relative's house when he stumbled upon the makeshift safety device.
The bomb disposal team received a call about the bizarre find at around lunchtime on Friday.
"A homeowner appears to have put some small railway track explosives around a safe to safeguard it," said a spokesman for Devon and Cornwall Police.
Railway detonators are used as a warning signal to train drivers. Strapped to the top of the rail, they emit a loud bang when a train wheel passes over them. The small explosives are used in a number of situations including warning of engineering works, dense fog or an obstruction on the line.
The police spokesman said no one had to be evacuated from the property and no one had been injured.