Fire-mine: A geothermal vent in which the panserbjorne work in metallurgy; supposedly impenetrable to humans and witches.

With a little luck, he could make this old-fashioned sailor a hero, get him promoted, and gain another ally in the supposedly impenetrable Guard at the same time.

The Adar saw the translucent hull and the complex geometrical city contained within the supposedly impenetrable walls.

For those who treasure the breaking of supposedly impenetrable barriers, Roger Bannister will always be a hero.

Caxias had a road cut through the supposedly impenetrable Chaco, located on the other side of the Paraguayan River where the Allied army was camped.

SCOTTISH women have now broken into another supposedly impenetrable male bastion - international rugby, writes Sarah Wilson.

Professor Tiermann and his family live alone here in a futuristic, fully automated Dreamhome, protected by a supposedly impenetrable force shield.

Ob then lays siege to last remaining humans holed up in Ramsey towers, using heavy artillery he is able to breach the supposedly impenetrable building.

Delcamp did so, and through that block - the supposedly impenetrable shield of a Prime Operator - Garlock insinuated a probe.

Besides, it would give him great satisfaction to break through these supposedly impenetrable walls using his own magic.