Storage being this volatile would make it easy to cover your traces and make sure the data doesn't fall into the wrong hands.
They collapsed the tunnel after them, at the end, to cover their traces and prevent anyone from following them.
Men with limited time to cover their traces do not always choose the most infallible way.
He has succeeded so far in covering his traces completely.
They put that down to having successfully covered their traces, but such an explanation is quite absurd.
Even so, he could have acted out of anger, I suppose, and covered his traces somehow.
Sir William had taken steps to cover his traces on the journey, and so probably had the other two.
"Well, we have covered your traces with the doctor," she continued.
It gave me opportunity to cover my own traces.
But she had always been careful to emerge from the tunnel and cover her traces while there was still dust in the container.