House Orlock is known as the "House of Iron" because its foundations lie upon deep ferrous slag pits. The hivers mine these pits for the debris of ancient times and extract enough pure metal from the refuse to serve their industries. Over the centuries extensive mining of the slag has caused some lower domes to collapse. In the past this led to hivequakes and the destruction of several overlying domes.
For many centuries the House has fulfilled the Ulanti Contract, a lucrative deal by which one House supplies the core requirements of the Ulanti Noble House. Previously the contract was supplied by House Delaque, but the Orlocks usurped the position by bribing Underhive gang raiders to destroy fuel lines into a Delaque guild factory. Since then the two Houses have taken every opportunity to discredit each other. Five years ago Lord Hagen Orlock was assassinated by the Delaques and relations between the Houses have never been so tense.