Because there was nothing else to do, Grant unscrewed his helmet and let it fall back on its hinge.
As he unscrewed the cap of the tank and peered in, he saw that it was bone dry.
Her voice roused him; with an effort he found and unscrewed the flask.
In both the bolt is unscrewed, leaving the "heads" embedded.
He unscrewed the cork and gravely offered it to us each in turn.