He sent commands to his fighter, and a panel opened.

The second panel opened in the old Emperor's private office.

The panel opened, and we hurried on to the platform.

It halted at ground level, and the panel on one side opened.

The panel in the top floor room had opened!

Only a few minutes had passed when the panel opened again.

The panel above them opened and a fireman looked down.

The panels opened, and I saw the sea entirely white all round.

Wolfe was there by the hole in the wall with the panel opened.

Then a panel in the building's roof opened and a man stuck his head up.