the power of the explosion, which surprised even gunpowder experts, was such that seven-foot deep solid concrete walls (made deliberately to replicate how archives suggest the walls in the old house of lords were constructed) were reduced to rubble. measuring devices placed in the chamber to calculate the force of the blast were themselves destroyed by the blast, while the skull of the dummy representing king james, which had been placed on a throne inside the chamber surrounded by courtiers, peers and bishops, was found a large distance away from the site. according to the findings of the programme, no-one within 100 metres of the blast could have survived, while all the stained glass windows in westminster abbey would have been shattered, as would all windows within a large distance of the palace. the power of the explosion would have been seen from miles away, and heard from further still. even if only half the gunpowder had gone off, everyone in the house of lords and its environs would have been killed instantly.