This one rumbled open as they approached it, without any signal.

The door at the end of the corridor rumbled open.

Without warning, the van's back door rumbled open, starling both of us.

As she spoke, the gate to the arena itself rumbled open.

One of the huge doors rumbled open, then an engine sprang to life.

He pressed a button set in the wall, and the doors rumbled open.

"Oh," I said to the girl as the elevator door rumbled open.

The security gate rumbled open and she drove through.

The van's side door rumbled open on its track, and the kids piled into it.

She was still there when the elevator rumbled open.