the new building for the SIS. The NAO put the final cost at £135.05 million for site purchase and the basic building or £152.6 million including the service's special requirements. The site is rumoured to include a tunnel under the Thames from the building to Whitehall. The numerous layers over which the building is laid out create 60 separate roof areas. 25 different types of glass were used in the building, with of glass and aluminium used in the building's construction. The windows in the SIS building are triple glazed for security purposes. Due to the sensitive nature of MI6's work, large parts of the building are below street level, with numerous underground corridors serving the building. Amenities for staff include a sports hall, gymnasium, aerobics studio, a squash court and a restaurant. The building also features two moats for protection. The building was completed in April 1994 and officially opened by Queen Elizabeth II accompanied by Prince Philip, Duke of Edinburgh, on 14 July 1994. Recent history In September 2000, the building was attacked by unapprehended forces using a Russian-built RPG-22 anti-tank rocket, causing superficial damage. The Metropolitan Police recovered the discarded rocket launcher at Spring Gardens park in Vauxhall, as well as finding remains of the rocket which had exploded against an eighth floor window. Dissident Irish Republicans were believed to have been behind the attack. Writing in The Daily Telegraph after the attack, journalist Alan Judd referred to detractors who wished a less visible physical presence for SIS; writing that "Both sides of the Whitehall debate might now claim vindication by the rocket attack: on the one hand, the building's profile made it an obvious target; on the other, a headquarters with expensive security protection has been shown to be necessary." On 1 June 2007, the building and its curtilage were designated as a protected site for the purposes of Section 128 of the Serious Organised Crime and Police Act 2005. The effect of the act was to make it a specific criminal offence for a person to trespass onto the site. In August 2010, two men from North Wales were arrested after a parcel bomb was found at the SIS building's postal handling centre. The Queen visited Vauxhall Cross for a second time in February 2006, and Charles, Prince of Wales visited in July 2008. In June 2013, Prince Harry visited Vauxhall Cross and was given